Question

how is alternate heating and cooling cause a rock mass to break up .
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Answer 1

Answer:

But rocks are poor conductors of heat, so the temperature effects are limited to the outer few centimeters of their surfaces while the interior remains cool. The cycle of heating and cooling creates an accumulation of stresses called thermal fatigue that fragment the rock surface

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Answer 2

Explanation:

due to alternate heating and cooling the particles in rock get weak attraction force so they break up