Which type of weathering is the result of water freezing and expanding inside the cracks of rocks when it freezes? a. biological weathering
b. chemical weathering
c. frost wedging
d. deposition ​

C. frost wedging

Explanation:

Frost wedging is the process by which water seeps into cracks in a rock, expands on freezing, and thus enlarges the cracks. So, therefore, the answer must be C.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.