In some areas of the world, large masses of moving ice create valleys through weathering and erosion. this is an example of

Mass wasting

Explanation:

Mass wasting is defined as the downward flow of earth materials such as soils, rocks under the influence of gravity. It involves both the weathering and erosion process. The erosion caused by the downward moving ice is an example of mass wasting process. In simple words, it is also known as the glacial erosion. The glaciers while moving downward, plucks the materials that undergoes weathering and these materials are further carried downward along a slope due to influence of gravity. This forms a valley as it flows downward and the eroded materials are deposits at the base of those mountain slopes.

i think the answer is a and b

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higher potential

explanation:

because it is in a high speed so it must move into a of high potential