Water seeps inside cracks in a boulder and freezes. Over time, the cracks expand and the boulder breaks in half. What process caused this change in the rock?

it may be erosion, I'm not quite sure but it could possibly be a form of erosion.

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.