Question

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?

Answer 1

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

Answer 2

"A rift valley is formed when the forces of tension of the earth are quite strong, so much to the extent that they are able to create splits in the plates moving them apart, resulting in the formation of a graben.

So the statement that justifies the formation of rift valley is the following:

Rift valleys can form when fractures in Earth’s crust widen

"