Clouds are made of water. When water evaporates it turns into clouds. So, I think the answer is EVAPORATED water.
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The answer is A-Gravity. Why? This is because B and C are examples of chemical weathering and not mechanical. Although choice D may seem viable lava intrusion is not a direct cause of mechanical weathering although lava pushing upward may help in aiding mechanical weathering it would not be considered a big enough cause, thus gravity is the correct answer.
The movement of rock pieces and other materials on earth's surface is called Weathering
