Social Sciences, asked by Chitraaidlaan, 1 year ago

Chapter 2 of Geography NCERT of class 7th​

Answers

Answered by Anonymous
5

Book work

2). MCQ★

  1. Igneous
  2. Core
  3. Sedimentary rocks
  4. crust

Notebook Work

Key Terms★

  • Fossils = The remains of the dead plants and animals trapped in the layers of rocks are called fossils.
  • Rock = Any natural mass of mineral matter that makes up the earth's crust.
  • Rock cycle = The process of transformation of rock from one type to another under certain conditions in a cyclic manner.

Question / Answers★

Question 1). What are the three layers of

the earth?

Answer = The 3 layers of Earth are:-

  • Crust
  • Mantle
  • Core

Question 2). what is a rock?

Answer = any natural mass of minerals matter that makes up Earth's crust is called a rock. rocks can be of different colour, size and texture.

Question 3). name three types of rocks.

Answer = The three types of rocks are:-

  • igneous rocks
  • sedimentary rocks
  • metamorphic rocks

Question 4). how are extrusive and intrusive rocks formed?

Answer = extrusive : extrusive rocks are formed due to rapid cooling and solidification of molten magma on earth's surface.

Intrusive: intrusive rocks are formed when molten magma cools down inside the earth's crust.

Question 5). what do you mean by a Rock cycle?

Answer = the change of one type of rocks into another under certain conditions in a cyclic manager is called the Rock cycle.

Question 6). what are the uses of rocks?

Answer = rocks are very useful to us. the hard rocks are used for making roads, houses and buildings. you use stone in Many games. For ex. seven stone, 5 stone , etc.

Question 7). what are metamorphic rocks?

Answer= these type of rocks are formed when igneous and sedimentary rocks indergo heat and pressure are called metamorphic rocks.

Give reasons

Question 1). we cannot go to the centre of the earth?

Answer= the radius of the earth is more than 6000 kilometre. to reach the centre of the earth, we have to dig a hole to this depth which is impossible.

Question 2). sedimentary rocks are formed from sediments.

Answer = rocks break down into small fragments under various conditions. these fragments are called sediments. these sediments are transported and deposited by wind and water .these type of rocks are called sedimentary.

Question 3). limestone is changed into marble.

Answer = underunder the effect of heat and pressure limestone changes into marble which is an example of metamorphic rocks.

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