Page 223 - New Medley 5 Semester 2

AT ONE GO

 Rocks are of three types – igneous, sedimentary and metamorphic.
 Igneous rocks are formed by cooling of magma and lava.
 Sedimentary rocks are formed by sedimentation of earth pieces.

 Igneous and sedimentary rocks change into metamorphic rocks.
 Fossil fuels are formed by the decomposition of remains of living organisms.

 Coal, petroleum and natural gas are fossil fuels.

REMEMBER THESE TERMS

Decomposition : Rotting gradually by natural chemical processes

Evolution : The gradual changes by which present-day living beings have been produced
Metamorphosis : A change of shape
Conserve : To use something without wasting it

Check Your Study

A. Tick () the correct answers.

1. Rocks formed from magma are
(a) Igneous rocks (b) Metamorphic rocks

(c) Sedimentary rocks (d) Coal

2. Igneous rocks were formed due to

(a) Earthquakes (b) Volcanoes

(c) Tides (d) Storms

3. is is a non-metallic mineral.

(a) Gold (b) Copper
(c) Emerald (d) Aluminium

4. is is not a fossil fuel.
(a) Coal (b) Petrol

(c) Natural gas (d) Wood

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