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Answer:
Two forces that have changed earth's surfaces are erosion and weathering. Erosion has changed the shapes of large rocks, mountains, and completely changed some habitats. Weathering slowly breaks down rocks via water and weather.
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The 4th option is the answer.
The subject tells whom or what the sentence is about, and the predicate tells what the subject is or does.
Example: The dog ran.
Explanation: The dog is the subject of the sentence, because the sentence is telling something about that dog.
