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.

4- c, because all matter stays the same no matter what. it is still there. 5- b, because matter is known as mass. 6-c because, flammability is a chemical property. malleability is changing the shape of an object.

  super sorry but i dont know lo