Rift valleys can form when fractures in Earth's crust widen. The valley walls slowly move at a rate of only a few millimeters a year. Which of these best
describes the type of tectonic activity that forms rift valleys?
A Rift valleys form where a continental plate moves under an oceanic plate.
B Rift valleys form where a plate slides horizontally past another plate.
Rift valleys form where two plates move away from each other.
D Rift valleys form where an oceanic plate moves under another oceanic
plate.
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