Page 115 - ICSE Science 3 : E-book

TERMS TO KNOW

1. Resource: Something that is available for use

2. Natural resource: Useful things that occur naturally in the environment
3. Sources of energy: The resources from which we get energy
4. Renewable sources of energy:The energy sources that can be used again and again

5. Non-renewable sources of energy: The energy sources that are found in limited
quantity and cannot be produced again
6. Solar energy: The energy that we get from the sun
7. Wind energy: The energy that we get from the moving air

8. Hydroelectric energy: The energy that we get from the running water
9. Conservation of energy: The process of saving energy by reducing its use and
wastage

QUICK LOOK

1. The sunlight, heat and energy given out by the sun makes life possible on the earth
and keeps its surface warm.

2. Solar energy that we get from the sun is the cleanest source of energy.
3. The sun warms up the earth’s surface and causes changes in weather. It also causes
changes in seasons.

4. We wear clothes and eat food according to the season.
5. Sources of energy can be broadly classifi ed into renewable and non-renewable
sources of energy.
6. Since some energy sources are limited, available energy must be used with care.

EXERCISES

A. Fill in the blanks.

1. Solar roof panels contain many ____________ that absorb solar energy
to produce electricity.

2. The ____________ is a natural source of energy.

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