Rachna Sapra solutions for जॉग्रफी [इंग्रजी] इयत्ता ९ आईसीएसई chapter 5 - Rocks [Latest edition]

About ______ of the earth’s crust is made up of eight elements.

The most common minerals in the rocks are ______.

The classification of rocks into igneous, sedimentary and metamorphic rocks is based upon ______.

Can igneous rocks change into metamorphic rocks?

These rocks have a typical stratified structure and the layers of material deposited can be prominently seen. Which category of rocks do they represent?

The horizontal layers of intrusive igneous rock are ______.

Which type of rocks provides sand and gravel for construction purposes?

Shale gets changed into which metamorphic rock?

Regional metamorphism takes place due to ______.

Sandstone, shale, conglomerate and mudstone are examples of which type of sedimentary rocks?

Which rocks are called the primary rocks?

Rock cycle is a continuous process, What is its start and end point?

Pumice stone with a vesicular texture that is often used for scrubbing purpose belongs to which category of rocks?

Valuable metallic minerals are usually associated with which type of rocks?

Assertion (A): There are about 2000 minerals in the earth’s crust that have been identified and named.

Reason (R): The source of all minerals is hot molten magma.

Assertion (A): Minerals such as coal, petroleum and natural gas are organic substances found in solid, liquid and gaseous forms.

Reason (R): Coal, petroleum and natural gas are found in sedimentary rocks.

Assertion (A): Intrusive rocks have bigger grains.

Reason (R): They are formed outside, on the earth’s surface.

Assertion (A): There are three major types of rocks.

Reason (R): The rocks have been classified in three categories on the basis of their characteristics.

Assertion (A): Sedimentary rocks are formed as a result of the process of lithification.

Reason (R): When the loose sediments turn into hard rocks, this process is known as lithification.

Read the passage carefully and answer the following questions.

1. Why do the extrusive igneous rocks have small and smooth crystals?
2. Which is the most common type of rock formed from the cooling down of lava?
3. Why does the pumice rock have bubbly texture?

Define ‘rock’.

What are the three types of rocks found on the Earth?

Name two types of intrusive igneous rocks.

What is sills?

What is dykes?

What is meant by rock cycle?

Why are the igneous rocks also called the primary rocks?

Which rocks are associated with fossil fuels?

How are igneous rocks formed?

Give two examples of igneous rocks.

State two points of distinction between rocks and minerals.

What is lithification?

Name the most common elements of the Earth’s crust.

How metamorphic rocks are formed?

Give two examples of metamorphic rocks.

What is thermal metamorphism?

Write down two main characteristics of the extrusive igneous rocks.

Write down two main characteristics of intrusive igneous rocks.

Give two examples of sedimentary rocks.

What do you understand by dynamic metamorphism?

Give an example of dynamic metamorphism.

Define the term batholith.

Draw a well labelled diagram of rock cycle.

What are the agents of sediment deposition?

Find the difference between:

Igneous and sedimentary rocks

Based on the reason of metamorphism, how many types of metamorphism are there?

Name different types of sedimentary rocks.

What are hypabyssal rocks?

Give reasons:

Lava rocks are fine grained.

Give reasons:

Sedimentary rocks are stratified.

Name the two most common minerals found in the rocks.

Give reasons:

Igneous rocks are suitable for construction purpose.

Give reasons:

Limestone is called the calcareous rock.