Physics
The cover of a solar cooker is made of glass because

It retains the heat inside by the green house effect
It absorbs sun's rays
It rediates heat better than metals
It reflects sun's rays

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

sand is soft and concreter is hard.
the friction between sand and feet is more than that between concrete and feet.
the sand is grainy but concrete is smooth.
the friction between sand and feet is less than that between concrete and feet.

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