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You can research these individually to learn more about each :)
Answer:
Explanation: A dune is a mound of sand formed by the wind, usually along the beach or in a desert. Dunes form when wind blows sand into a sheltered area behind an obstacle. Dunes grow as grains of sand accumulate. Every dune has a windward side and a slipface.
Answer:
D. Tectonic Plates
Explanation:
The earth's crust consists of moving tectonic plates dividing the crust and are responsible for the landscape of the Earth.