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How oxygen gas in air helps in burning.

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How carbon dioxide gas is important for plant.

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What the atmosphere of saturn is made of .

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

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What the atmosphere of mars and Venus are made of

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What is oxygen? Give importance

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What is nitrogen? Give importance.

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What is compressed air

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What is humid air

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What is ozone layer.

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How far away is the Moon from the earth.

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What is the natural satellite of the earth

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What last quarter.

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What is solar energy.

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What is lunar month.

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What is milky way galaxy.

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What is waning gibbous.

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What holds the earth in its orbit.

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How long it takes for the Moon to complete one orbit around the earth.

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Why the sun looks bigger than the other stars

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