Structure of the Earth, Internal Processs and Weathering

Question 1

The upper layers of the earth, an important source of heat is the

Answer 1

Radioactive minerals like uranium and thorium

Question 2

The rate of increase of temperature inside the earth undergoes

Answer 2

An increase at greater depth from the surface

Question 3

It is believed that the earth is composed of three parts, name them

Answer 3

1. Crust.
2. Mantle.
3. Core.

Question 4

What is crust?

Answer 4

It is also also known as lithosphere
1. It consist of two parts, Sail and Sima

Question 5

Explain sail

Answer 5

1. Solid or continental parts of the earths crust.
2. Composed of many kinds of rocks, which have the density and composition of granite.
3. Good night is often called Sahil because it is the predominance of silica and aluminium.
4. it is above the Sima

Question 6

What is Sima?

Answer 6

1. It is called so because it is rich in silica and magnesium.
2. It has similar similar composition and average density to that of common black volcanic lava called as salt.
3. The crust is thickest beneath the mountain and thinnest under the ocean
4. Mostly cons of sedimentary rocks.

Question 7

Thetic layers consisting of mostly continent and biotic layer of ocean form, the upper layer of the earth called the

Answer 7

Crust

Question 8

What is Mohru discontinuity?

Answer 8

It is the layer between the crust and the mantle

Question 9

Describe the mantle

Answer 9

1. Earth, 2nd layer.
2. Upper boundaries marked by Mohru discontinuity and lower boundary by Gutenberg discontinuity..
3. Depth varies from 35 to 2000 and 900 km.
4. Composed of magnesium and iron silicate is and sulphide in the upper mantle and nickel and iron in the lower mantle.

Question 10

What minerals are found in the upper and lower mantle?

Answer 10

Upper -In silicate and magnesium and substantial quantities of sulphide
Lower - nickel and iron

Question 11

The mantle is divided into two parts, name them

Answer 11

1. Upper mantle or asthenosphere.
2. Lower mantle or mesosphere.
3. Lower part of a sphere is solid, but upper part of astronomer sphere is partly molten state.

Question 12

Baphe or core consist of two layers-

Answer 12

Core and inner core

Question 13

Describe the core

Answer 13

1. Central part of the Earth.
2. Dense nickel, iron alloy called knife.
3. Temperature is about 2700°.
4. Perimeter commence at the Gutenberg discontinuity, where the outer core exist in molten form.

Question 14

Describe the inner core

Answer 14

1. Radius of 1400 km.
2. Consist of knife.
3. Forced into solid state by increased pressure.
4. Density of layer ranges from 14.5 to 16.
5. temperature is around 4000°C.