Clouds play an important role in Earth's . Clouds can block the sun's by reflecting part of the rays back into space. The shadow effect of clouds helps to make Earth's surface . Clouds also thermal infrared that is emitted from Earth's surface to space. Higher clouds at night trap Earth's heat to keep it warm. Low, thick clouds solar energy back to space. choices: balance, radiation, reflect, cirrus, radiation, cumulus, cooler, energy, absorb

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