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Two students are discussing weathering and erosion factors. Leah says that both weathering and erosion involve wind, water, and ice. Justin says that only weathering involves ice, and that erosion involves plants and animals. Who is correct?


A. Justin, because plants cause erosion too.
B. Justin, because erosion does not involve ice.
C. Leah, because she forgot to mention plants and animals.
D. Leah, because glaciers are ice that cause erosion too.