Rocks Soils and Minerals question and answer class 3 । Ananda marga school std-3 science chapter 12 Rocks Soils and Minerals exercise answer

ANANDA MARGA SCHOOL

CLASS – 3

Science

Chapter 12

Rocks, Soils and Minerals

Exercise answer

1. Answer the following questions

a) How many kinds of rock are there? Give some examples.

Answer: There are three main kinds of rocks: igneous, sedimentary, and metamorphic. Examples include granite (igneous), sandstone (sedimentary), and marble (metamorphic).

b) Which is the hardest rock?

Answer: The hardest naturally occurring rock is diamond, which is a form of carbon.

c) What kind of rock is sandstone?

Answer: Sandstone is a sedimentary rock that is formed from the cementation of sand grains.

d) What kind of rock is marble? How can you use it?

Answer: Marble is a metamorphic rock that is formed from the recrystallization of limestone. It is used for sculptures, countertops, and building materials.

e) What kind of rock is used to make talcum powder?

Answer: Talcum powder is made from the mineral talc, which is a metamorphic mineral.

f) What is the difference between rocks and stones?

Answer: The terms "rock" and "stone" are often used interchangeably, but in geology, a rock is a naturally occurring solid mass or aggregate of minerals, while a stone is a piece of rock that has been shaped or cut for a specific purpose, such as in construction or jewelry.

g) How many colours of rock are there?

Answer: There are many colours of rock. Rocks are composed of different minerals, and the specific minerals present determine the rock's colour.

2. Name the rocks

1) Used in ancient forts: Sandstone

2) Used for roofs: Slate

3) Used for making powder: Limestone

4) Used as jewellery: Marble

5) Used for cooking purposes: Soapstone

3. Fill in the boxes with correct answers

a) Marble is a hard rock.

b) Sandstone is red/grey in colour.

c) Limestone is soft rock.

d) The Taj Mahal is made up of white marble.

e) Graphite is black.

4. Match the following

1) Soapstone – soft rock.

2) Limestone – lime.

3) Sandstone – very smooth.

4) Slate – hard stone in layers.

5) Graphite – lead pencil.

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