Rocks

Question 1

What is the composition of the earth’s crust?

Answer 1

Rocks

Question 2

How are rocks formed?

Answer 2

By minerals

Question 3

What are special features in rocks formed by minerals?

Answer 3

-Some are soft while some of them are hard
-The rock layers are thin in some places while it is deeply spread in others.

Question 4

What are the factors that determine the values of the rocks?

Answer 4

Composition, distribution, structure

Question 5

Rocks can be classified into 3 types based on their origin. What are they ?

Answer 5

1.Igneous rocks
2.sedimentary rocks
3.metamorphic rocks

Question 6

How Igneous rocks are formed?

Answer 6

Igneous rocks are formed by magma coming from the interior of the earth and solidifying on the crust.

Question 7

Give another name for Igneous rocks.

Answer 7

Basic rocks

Question 8

How Igneous rocks are formed?

Answer 8

By immense heat and pressure.

Question 9

What type of structure does it have?

Answer 9

There is a glassy and soft granular structure in them.

Question 10

Give some examples for Igneous rocks

Answer 10

-Granite
-basalt
-gabbro

Question 11

There are 2 types of igneous rocks.what are they?

Answer 11

1.Intrusive igneous rocks
2.Extrusive igneous rocks

Question 12

How Intrusive igneous rocks are formed?

Answer 12

They are formed by cooling and solidifying magma in the interior of the earth.

Question 13

How extrusive igneous rocks are formed?

Answer 13

These are formed by cooling of hot magma when reaching the surface of the earth

Question 14

Write 5 uses of igneous rocks.

Answer 14

-Granite is used to construct buildings.

-Making ornaments.

-To obtain minerals such as tin and chromium.

-Igneous rocks, which are resistant to erosion, in slopes prevent soil erosion.

-To construct highways and roads.