Erosion occurs when natural forces alter a landscape. what does it mean to alter a landscape
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The question is asking "erosion occurs when natural forces alter a landscape. What does it mean to alter a landscape " - and the answer is that it means that something is changing how the landscape looks like. For example, a river would make a valley deeper through carrying stones with the water and removing sand from the bottom of the river, and so the valley would be altered, that is changed.

500bc indiais the answer.

So3 that’s what i think