In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.

Question: Olive and Jean were collecting rocks during a hike, they collected too many rocks so the two girls decided to leave some rocks behind to come back to later. Olive decided to bury her rocks in the dirt, and Jean decided to leave hers in a ditch in the sun. When they returned a week later, which girl's rocks changed the most? 
 Answer: Olive
With more surfaces of the rocks exposed, there are more places for chemical weathering to occur.

Question: If there were less dissolved carbon dioxide in ocean water, the ocean's rate of acidity would 
 Answer: decrease
With higher levels of dissolved carbon dioxide in ocean water, the water becomes more acidic.

Question: People rarely go snow skiing in the plains because lower altitudes are _____ and are less likely to have snow. 
 Answer: warmer

Glaciers often form in the mountains because higher altitudes are colder and more likely to have snow that falls and collects.