The four major agents of erosion are

Wind, ice, gravity and water are the four agents which are responsible for the erosion of soil.

Explanation:

Erosion is a wear away (removal) of soil particles through a number of agents such as wind, water, ice and gravity. It has a negative effect on the soil because it removes the layer where plants are grown.

It is mostly occurs in the areas where no vegetation is present. In the presence of vegetative, soil particles are attached to the roots of the plants which reduces the chances of erosion.

i think the answer is b.

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

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