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What is the importance of gravity

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How oxygen gas in air helps in burning.

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Define gravity

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Draw a table to show composition of different gases in the air and their percentages.

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What is the sound range of human ears

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What is magnetic field.

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What is ozone layer.

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How is waste is causing pollution.

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What are electromagnets

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What is land pollution.

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What the atmosphere of mars and Venus are made of

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What is magnetic compass

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What are protozoa.

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What is lightening? How is it produced

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Define friction.

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What is demagnetization.

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What holds the earth in its orbit.

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What is lunar month.

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What are two types of electricity.

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Give some example of biodegradable waste

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