why the trunks of tree and roads appear shaking during the summers
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It heats up the air in contact. Convection currents are set up in air. Light rays passing through this air change their path due to refraction. This gives shaking appearance to the objects from which these light rays start.
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during summer days ,roads become hot which in turn expand in air in contact with it and make it rarer .Air near the road is more rare and the far off air becomes more denser .
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