Chapter 3

The Earth's surface and its changes 

1. Write the answers given below- (within 30 standard words)

(a) What does the atmosphere boil?

Answer:  The layer of air covering the earth's surface is called the general atmosphere. Air consists of oxygen, nitrogen, carbon dioxide, helium, argon, argon and hydrogen gas. There is dust and smoke in the air.

(b) How much does the board produce in a year?

Answer:  1-1.5 cm per year  . Mr. Up to speed bully has settled in the scientific college.

(c) Writing on topical issues.

Answer:  Different batahs are said in different seasons of the year. The reason for this is the temperature and pressure variation in the atmosphere. As a result of this, the air pressure varies. As a result of the change, the high pressure area followed by the low pressure area is called a temporary depression. Jalavatah, Sthalavatah, Mouchumi Batah, original temporary Batah.

(d) What is a sand dune?

Answer: Dunes are -  When the speed of wind slows down in some areas of the desert, sand dunes are formed.

(e) What is horseshoe lake?

Answer:  The course of the river in the plains is meandering. This movement of the river is called the spiral movement. Ketiaba river's level increases. When the water of the river is low, the river is dry, but when the water of the river Barisha is high, the river swells with great force. In the river, the sand accumulates in front of the tributaries and separates after the main river and the tributaries become bill or heart. Horseshoe-shaped lakes are known as horseshoe-shaped reservoirs.


2. Correct answer ☑ with chin.

(i) Which of the following protects us from the harmful rays of the sun?

(a) Carbon dioxide (b) Nitrogen (c) Oxygen

Answer: (c) No one

(ii) The names of glaciers are 一

(a) Floodplain (b) Woodland (c) Village

Answer: (c) Grav

(iii) Name of precipitation on earth in the form of water

(a) Rain (b) Clouds (c) Ice

Answer: (a) Year.

(iv) Kathfula-shaped rock piles

(a) Deserts (b) River valleys (c) Floodplains

Answer: (a) Desert.

(v) The most important layer of the atmosphere for humans is

(a) Meschosphere (b) Stratosphere (c) Troposphere

Answer: (c) Traps.

(vi) Formation of horseshoe shaped lakes

(a) Glacial regions (b) River valleys (c) Deserts

Answer: (b) River valleys.

3. Sofal's talk is similar to Baofal's talk

                Baofhal     -     Sophaal

(a) Trade channel -    middle part of the river
(b) Glaciers -  endemic batah
(c) Lu -  Non level
(d) Spiral motion -  river of ice
(e) Straight' Sphere     - Niyat Batah 
                                    Earthquake
                                  

Answer:

( a) Trade news 

( e) Intentional statement 

( b) Glacier 

( d) Ice River 

( c) Lu 

( b ) Local batah

( d ) Spiral motion

( a) Middle part of the river 

( e) Straight air 

( c) Non - public level 



4. Show reason (within 50 standard words)

(A) Semeka Batarat Tita Kapo's Sonakale Nushukaya.

Ans:  At present there is more water vapor in the atmosphere and thus the air does not have the capacity to hold more water vapour. It takes time to fight off Tita Kapo.

(b) Treatment of flood plains.

Ans:  In flood plains, there are rocks and stones on the flood plains and sand dunes, the remains of trees and branches are formed by sediments and rocks, but they are more powerful. 

(c) Some rocks from the desert are woody in shape.

Ans:  In the desert, there is very fine dust and rain. But there are sand particles or materials of that shape. I can't take it too far. It is the mining capacity of the sand particles at a certain height. In that way, the rock fragments from the desert bed are eroded to a certain height and form the wood-shaped rocks. 

(d) Both polar regions are colder than equatorial regions.

Ans:  Sun's rays refract in the equatorial region and refract in the polar regions. Therefore, the two polar regions are colder than the equatorial regions.