ESSAY ON SAVE THE EARTH

let’s start the essay on save the earth…

Introduction

There are eight planets in our solar system. Sun and eight planets together form the solar system. The planets starting from Sun are in order following as:-Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

All these planets move around the sun in a fixed path called orbits.

Mercury, Venus, Earth, and Mars are terrestrial planets and are primarily composed of rocks and metals. Jupiter and Saturn are the gases of giant planets. These are composed mainly of hydrogen and helium. Uranus and Neptune are the ice giants.

But Earth is the only planet where there is a compatible environment for all living organisms. Sunlight, Air, Water, and Vegetation are available on it which makes life possible.

Earth obtains heat and light from the sun. the sun is the source of energy on Earth. So, we need to save the earth for sustainable living.

Shape of Earth

Earth is in the third order from the sun. It is also known as the harbor and support of life for living species on it. 29.2 percent of its surface island which constitutes continents and islands and rests 78.2 percent is covered with water.

It is slightly bulged at the equator and is flattened at the pole. So it is not perfectly round and that’s why the shape of the earth is called Geroid

Do you know? The sun is about 150 million kilometers away from the Earth? But it takes only eight minutes for sunlight to reach us.

Earth’s Movement

Earth shows two types of movements. It spins around the imaginary line that is called the axis which passes through the center of the earth.
This spinning movement is called rotation. It takes 24 hours to complete one spin or rotation. This causes day and night on earth.

Other movements of the earth go around the sun in an imaginary path that is called the orbit. This type of movement is called revolution.
It takes 365 days and 6 hours to complete one revolution.
It causes changes in the season on Earth.

Earth is a precious planet

As most part of it is covered with water, the perceived color of it is blue. Three parts of the earth are covered with water and one part is made up of land. The land is not the same everywhere, but it includes valleys, deserts, plains, and islands on earth. These natural features of the earth are called landforms.

Earth consists abundance of resources for life. These resources are helpful for living on it. Sunlight, oxygen in the air, water, creature thriving on /in them, minerals, and vegetation are found abundantly on it.

These resources are precious and blessed gifts of God that we do not count on.

These are valuable resources and we can’t imagine life without them. This is so because; human beings and all living organisms are dependent on Earth’s resources for their survival.

But today, these resources are being depleted and getting destroyed due to human reckless activities. We need to protect all these resources in order to protect our lives.

The problem has arisen on earth

Natural resources are abundant on Earth. But, human beings are utilizing these in unusual ways for their personal benefit. Their unusual activities driven by greed and selfishness have created extensive damage to the earth which is irreparable. If it does not stop then it will be very difficult to create a sustainable future on Earth.

Because of human activities, all living organisms are in peril. They only use it but do not compensate. They almost polluted all the natural resources which can now be taken a long time to compensate for it.

The most concerning matters today are pollution, overpopulation, deforestation, climate change, global warming, and ozone layer depletion.

These caused adverse effects on nature which is very alarming today. Today many birds, animals, and other species are getting extinct and the whole world is slowly approaching the end.

Humans are destroying the earth... 

Earth is only the planet where life is possible due to ample resources available on it. But human beings do not understand its value and injudiciously utilize it.

Population explosion is the main reason for it. Due to overpopulation, their demands increase. They are destroying forests in huge quantities. They use it for purpose of agriculture, houses, buildings, furniture, and other items.

These activities directly impact the environment. These cause air pollution. It reduces the clean oxygen and hence humans are getting difficulty in breathing.

It also causes floods, climate change, the greenhouse effect, ozone layer depletion, and unusual monsoons.

Moreover, it directly impacts birds’ and wildlife animals’ habitats. Most birds and animals are extinct because of it.

Today, people mostly use plastic items like plastic bags, plastic bottles, and other plastic-made materials. They use it due to the ease and convenience available. After use, most of this plastic is dumped into water bodies such as ponds, rivers, lakes, and oceans.

Some of them are dumped on land as well.  These cause water pollution. These activities unbalance the natural resources which cause the drinking water crisis.

These injudicious activities cause immense damage to the earth which is degrading it beyond repairs.

How can we save the earth?

As humans are the most sensible on earth amongst the other species. They have emotions, sensations, vision, and other amazing qualities which make them different from other living organisms on Earth.

But some activities are adversely impacting the lives of other organisms. So, they are only responsible for creating unbalance in the ecosystem and destroying resources on earth. So it is his responsibility to take the necessary steps to protect the earth and its resources.

There are some steps by which we can save the earth:-

• • Curb the population explosion
• Reduce, reuse, and recycle the process of material having non-biodegradable materials.
• •Don’t deforestation
• Plant more trees to compensate for deforestation.
• •Keep the surrounding area clean and try to make beautiful nature.
• •Don’t discharge industrial effluent in water bodies and installed effluent treatment plants.
• •Incorporate your habit of conserving water and water bodies.
• •Educate and make aware of people the importance of conserving nature.
• •Reduce the vehicles which eject smoke
• Use electricity vehicles and use cycle more.
• •Don’t smoke because it pollutes the air.
• •Love animals and birds as they contribute to ecological balance.
• •Choose sustainability in every step of life.

Conclusion

The problem that arose on earth is the global crisis. So, all measures should be taken globally as it can’t be resolved by only a single person. We all should come together and protect the earth.

It is possible only when we all understand the resources that are provided by Earth are limited. In order to safeguard humans and all living organisms, we need to protect the earth and take care of it.

We need to make aware of those people the consequence of not protecting the resources of the earth. If we start these collective efforts by determining then surely we can save our precious planet Earth and make it brighter Earth.

Class 7 Geography Chapter 3 Our Changing Earth

NCERT Solutions For Class 7 Geography Social Science Chapter 3 Our Changing Earth

Question 1.

Answer the following questions briefly:

A). Why do the plated move?

B). What are exogenic and endogenic forces?

C). What is erosion?

D). How are flood plains formed?

E). What are sand dunes?

F). How are the beaches formed?

G). What are the ox-bow lakes?

Answer:

A). Plates move due to the movement in the molten magma found in the interior of the earth.

B). Exogenic Forces:- Exogenic forces are those forces which act on the surface of the earth and cause change on the surface of the earth.

Examples: Weathering, gradation, erosion, deposition.

Endogenic Forces:- Endogenic forces are those forces which originate in the interior of the earth and cause changes on the surface of the earth.

Examples: Volcanoes and Earthquakes.

C). Erosion:- Erosion is the wearing away of the landscape by different agents like running water, glacier, wind, ground water and sea waves.

D). Flood plains are formed in the following manners:

•During rains rivers overflow their banks.

•This leads to the flooding of the nearby areas.

•After the flood has receded, a layer of fine material and other material is deposited over the plain in the form of sediments.

•This leads to the formation of the flood plain.

E). Sand Dunes:-  Sand dunes are heaps of sand deposited at a place by the wind’s action in the desert areas.

F). Formation of Beaches:-

•Sea waves strike the coasts.

•They erode the coasts and carry the eroded material in the form of silt and other material.

•When they withdraw they deposit the silt and other material (sediments) along the shore, forming wide beaches.

G). Ox-Bow Lakes:- 

•When the meander loop is cut-off from the main river, it forms a cut-off lake.

•Its shape is like an ox-bow. 

•Hence, the cut-off lake is called ox-bow lake.

Question 2. Tick the correct answer:

(i) Which is not an erosional feature of sea waves?

(a) Cliff

(b) Beach

(c) Sea cave.

(ii) The depositional feature of a glacier is

(a) Flood plain

(b) Beach

(c) Moraine.

(iii) Which is caused by the sudden movements of the Earth ?

(a) Volcano

(b) Folding

(c) Flood plain.

(iv) Mushroom rocks are found In

(a) Deserts

(b) River valleys

(c) Glaciers.

(v) Ox bow lakes are found In

(a) Glaciers

(b) River valleys

(c) Deserts.

Answer:- (i) – (a), (ii) – (c), (iii)-(a) , (iv) -(a), (v)-(b)

QUESTION 04. Match the following. 

Question 5. Give reasons:

A). Some rocks have the shape of a mushroom.

B). Flood plains are very fertile.

C). Sea caves are turned into stacks.

D). Buddings collapse due to earthquakes.

Answer:-

A). Some rocks have the shape of a mushroom, because of the following reasons:

•When’ rocks fall in the course of running dust-storms, the suspended particles of sand strike the lower portion of the rocks and erode them.

•The upper portions of the rocks remain unaffected/uneroded.

•In course of time the rocks take up the shape of a mushroom.

B). Flood plains are very fertile because of the following reasons:

•They are made of the silt and other material brought by floods.

•Due to spread of the new silt, the flood plains are fertile areas.

C). Sea caves are turned into stacks because of the following reasons:

•The sea waves strike the coasts and erode the soft rocks. Hard rocks remain uneroded. This action results in the formation of sea caves.

•In course of time the roofs of the caves also come down due to erosion and the arms/walls of the caves remain standing like pillars. 

• These pillars-like formations are termed as stacks.

D). Buildings collapse due to earthquakes because of the following reasons:

•Most buildings are not built/made earthquake-proof.

•When the earthquakes strike, the buildings are not capable of resisting the vibrations of the earthquakes.

•They tear apart due to shallow foundation, sub-standard interior material, and lack of adequate steel.

•They collapse and fall down like a pack of papers/cards.

Very Short Answer Type Questions

Question 1. What do you know about the lithospheric plates?

Answer: - The earth’s crust consists of several large and some small, rigid, irregularly— shaped plates, Le., slabs which cany continents and the ocean floor.

Question 2. How do the lithospheric plates move?

Answer:-  They move around very slowly, just a few millimeters each year. 

Question 3. What is a volcano?

Answer:-  A volcano is a vent or opening in the earth’s crust through which molten material erupts suddenly.

Question 4. Define focus’ and ‘epicentre’. [Imp.]

Answer:- The place in the crust where the movement starts is called the ‘focus’. The place on the surface above the focus is called the ‘epicentre’.

Question 5. Name the three types of earthquake waves.

Answer:-

1. P waves or longitudinal waves

2. S waves or transverse waves

3. L wave or surface waves.

Question 6. What is a seismograph? [V. Imp.]

Answer:- A seismograph is a machine which measures an earthquake.

Question 7. Name the scale on which the magnitude of the earthquake is measured.

Answer:- Richter scale.

Question 8. Which earthquake is classified as a major earthquake?

Answer:- An earthquake of 7.0 magnitude is classified as a major earthquake.

Question 9. Where is Victoria Falls located? [Imp.]

Answer:- Victoria Falls is located on the borders of Zambia and Zimbabwe in Africa.

Question 10. What is delta?

Answer:-  The collection of sediments from all the mouths forms a delta. It is a triangular-shaped landmass.

Question 11. Name some coastal landforms.

Answer:-  Sea caves, sea arches, stacks, and sea cliffs.

Question 12. How are glacial moraines formed? [V. Imp.]

Answer:- The material carried by the glacier such as rocks big and small, sand and silt gets deposited. These deposits form glacial moraines.

Question 13. Name the two processes which wear away the landscape.

Answer:- Weathering and erosion.

Question 14. What does the process of erosion and deposition create?

Answer:- The process of erosion and deposition create different landforms on the surface of the earth.

Question 15. Name a few rivers of the world that form a delta?

Answer:- Nile, Zaire, Ganga-Brahmaputra, Hwangotto, Murray-Darling, Amazon, etc.

Short Answer Type Questions

Question 1. Mention the work of ice.

Answer:-  Glaciers are rivers of ice that erode the landscape by destroying soil and stones to expose the solid rock below. Glaciers carve out deep hollows. As the ice melts they get filled up with water and become beautiful lakes in the mountains. The material carried by the glacier such as rocks big and small, sand and silt gets deposited. These deposits form glacial moraines.

Question 2. What is an earthquake? What are some common earthquake prediction methods?[V. Imp.]

Answer:-  When the lithospheric plates move, the surface of the earth vibrates. The vibrations can travel all around the earth. These vibrations are called earthquakes. Some common earthquake prediction methods include studying animal behaviour, fish in the ponds get agitated, snakes come to the surface.

Question 3. Give an account of earthquake preparedness. [V. Imp.]

Answer:-  Earthquake is a natural calamity which we cannot stop. But we can minimise its impact if we are prepared before-hand.

During an earthquake, we should shift to some safe spot. We should hide under a kitchen counter, table, or desk against an inside comer or wall. We should stay away from fireplaces, areas around chimneys, windows that shelter including mirrors and picture frames. Moreover, we should spread awareness amongst our friends and family members.

Long Answer Type Questions

Question 1. Explain the work of a river. [V. Imp.]

Answer:-  The running water in the river erodes the landscape. When the river tumbles at a steep angle over very hard rocks or down a deep valley side it forms a waterfall. While entering the plain the river twists and turns and forms large bends which are known as meanders. Due to continuous erosion and deposition along the sides of the meander, the ends of the meander loop come closer and closer.

In due course of time the meander loop cuts off from the river and forms a cut-off lake, which is also called an ox-bow lake. Sometimes, the river overflows its banks causing flood in the neighboring areas. As it floods, it deposits layers of fine soil and other material called sediments along its banks. As a result—a fertile floodplain is formed. The raised banks are called levees.

As the river approaches the sea, the speed of the flowing water decreases, and the river begins to break up into several streams known as distributaries. Then a time comes when the river becomes very slow and it begins to deposit its load. Each distributary forms its own mouth. The collection of sediments from all the mouths forms a delta, which is a triangular landmass.

Question 2. Give an account of the work of wind. [V. Imp.]

Answer:-  Wind is an active agent of erosion and deposition in the deserts. In deserts, we often notice rocks in the shape of a mushroom, known as mushroom rocks. Winds erode the lower section of the rock more than the upper part. Therefore, such rocks have a narrower base and a wider top. When the wind blows, it lifts and transports sand from one place to another.

When the wind stops blowing the sand falls and gets deposited in low hill-like structures. These are called sand dunes. When the grains are very fine and light, the wind can carry it over long distances. When such sand is deposited in a large area, it is called loess.