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What are the two main things that cause external changes on Earth?
A. weathering and erosion
B. physical and chemical
C. sheet and continental glaciers
D. hot and cold temperatures

Answer :

CloneArmy5
A.  Weathering and Erosion.    Erosion is basically water causing holes in the ground which then cause external changes on the earth.

A. Weathering and erosion

Ersion and weathering shape the earth and causes external changes, forming caves, canyons, and other landforms.

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