Which of the following is an example of physical weathering?
a. ice forming in cracks of rocks
b. acid rain falling on sidewalks
c. waves washing over rocks on the beach
d. water washing away soil in an area used by off-road vehicles

The correct answer is option a. "ice forming in cracks of rocks".

Explanation:

Physical weathering is a geological process that results in rocks breaking apart, but with a physical force that does not change its composition. Ice forming in cracks of rocks is an example of physical weathering known as Ice wedging. It results from water seeping down into the cracks of rocks, and when the temperature drops and water freezes, the water cracks the rocks as it expands when it becomes ice.

The given blank can be filled with the kinds of resident organisms.

Explanation:

In the regions of grasslands, the rainy seasons, the seasons of drought predicts in parts the types of resident organisms. An organism's adaptation relies upon the environmental and climatic conditions in which they thrive. By determining the environmental conditions of the location one can predict the idea of the species that thrive there.