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Points to Remember

Rocks : a hard natural substance
Sandstone : It is a soft stone
Granite : A most common rock
Pumice : A soft and light coloured rock

E XE R C I S E

A. Tick (ü) the correct answer.
1. Mountain, hill and valleys are made up of rocks/ice.
2. All rocks are made of minerals/soils.
3. Granite/Sandstone is an igneous rock.
4. Basalt/pumice is used as skin scrubber.

B. Fill in the blanks.
1. Rocks are made up of ......................
2. There are ............... different types of rocks.
3. ...................... is a dark, shiny and layered rock appearing like glass and having edges.
4. ....................... is formed from clay and mud deposited in river beds.
5. .........................is a metamorphic rock of granite.

C. Put a (ü) tick for correct and (û) cross for wrong statements.
1. Marble is an impure form of limestone.
2. Pyrite is an ore of iron.
3. Diesel is obtained from petroleum.
4. Slate is a metamorphic rock.
5. Paraffin wax is obtained from coal.

D. Explain the following topics.
1. Ore
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2. Fractional distillation
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3. Fossil fuel
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