Chapter-2 Inside our Earth

1. What are the earth's three main layers?

Explanation:

The  earth's three layers are

(a)Crust

(b)Mantle

(c)Core


2. What exactly is a rock?

Explanation:

The term "rock" refers to any naturally occurring mass of mineral substance that makes up the earth's crust. Rocks of diverse forms, sizes, colours, and textures make up the crust of the world.


3. List three distinct rock types.

Explanation:

The three categories of rocks are:

volcanic rocks

Conglomerate Rocks

Metallized Rocks


4. How do intrusive and extrusive rocks come into being?

Explanation:

In response, molten lava erupts from volcanoes, travels to the earth's surface, and quickly cools to solidify. Extrusive rocks are created in this manner. Basalt is an illustration.

Intrusive rocks are created when molten lava hardens deep within the crust of the earth. Consider granite.


5.What exactly is a rock cycle?

Explanation:

A rock cycle is the term for the cyclical process by which rocks change from one kind to another as a result of shifting environmental conditions.


6. How can rocks be used?

Explanation:

Rocks are used for a variety of things, including

I. They assist in building roads.

II. They are employed in the construction of  homes and other structures.

iii. Children play a variety of games with small s   stones.

They are a component in fertilisers.


7. Which rocks undergo metamorphism?

Explanation:

The right answer is that metamorphic rocks are those created by the heating and pressing of igneous and sedimentary rocks.


8. We are unable to travel to the earth's centre.

Explanation:

Since the temperature and pressure are so high there, not only do people melt there, but even rocks do. Therefore, we are unable to travel to the centre of the earth.


9. Sediments are the source of sedimentary rocks.

Explanation:

Sediments are the name given to the little pieces of rock that collide and break as they travel to the ground. By means of wind, water, etc., these sediments are carried and deposited, and after being compressed and solidified, they form a layer of rocks known as sedimentary rocks. This demonstrates how sediments give rise to sedimentary rocks.


10.Limestone becomes marble.

Explanation:

The correct answer is that heat and pressure cause igneous and sedimentary rocks to metamorphose. In the case of limestone, this occurs. Marble is a metamorphic rock that forms when limestone is heated and compressed.