Question

Internal Structure of the Earth
Let us look at the internal structure of the Earth we live on. We can see the continuity from the early days of the formation of the earth as we try to look deep inside the Earth! It took us years of scientific investigation and analysis of data to form an understanding of the interior of the Earth. The main reason for this is that even the deepest mines we have dug do not go beyond a few kilometres under the surface while the radius or the distance to the centre of the earth is over 6000 kilometres!
The earth is made upof three main layers
1. Crust
2. Mantle
3. Core
1. Crust: We live on the outer part of the earth which is called the crust. You saw in the last section how this layer was formed. This layer goes up to a depth of 30- 100 kms. The crust mostly consists of various kinds of rocks.
2. Mantle: It is 100-
2,900 kms in thickness. The upper part of the mantle is a pliable layer over which the crust floats. This consists mainly of chemicals called silicates.
3. Core: The core is 2,900 to 6376 kms in thickness. It is composed of dense and heavy substances like iron and nickel. It can be divided into two sub layers.
Outer Core: 2,900 to 5,100 kms composed of liquid metallic material likenickel and iron.
Inner Core: The solid inner core (5,100 – 6,376 kms) of the earth is made up of Iron compounds and heavy substances like gold. Interestingly matter from deep inside the mantle shoots up through volcanoes and fissures on ocean floors and cools down to form the earth’s crust. In many regions on the earth part of the earth’s crust enters into the mantle and once again becomes molten. This constant process of formation and destruction of the crust explains the fact that our Earth is still very active. The crust on which we live is still being changed by earthquakes, volcanoes,subduction of land and rise of mountains due to processes happening deep down the earth.
Read the above paragraph of “ Internal structure of the earth” and answer the question.
How can you say the earth is still very active?

Answer 1

In many regions on the earth part of the earth’s crust enters into the mantle and once again becomes molten. This constant process of formation and destruction of the crust explains the fact that our Earth is still very active. The crust on which we live is still being changed by earthquakes, volcanoes,subduction of land and rise of mountains due to processes happening deep down the earth.

Answer 2

Earth is still very active because it has to face so many worst situations like volcanos earthquakes but still it is active



Hope helps
☆☆☆☆☆☆