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?
A. Rift valleys form where a continental plate moves under an oceanic plate.
B .Rift valleys from where a plate slides horizontally past another plate.
C. Rift valleys form where two plates move away from each other.
D. Rift valleys form where an oceanic plate moves under another oceanic plate.

Answer 1

Answer:

A. Rift valleys form where a continental plate moves under an oceanic plate.

Explanation:

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? Rift valleys form where a continental plate moves under an oceanic plate.

Answer 2

Due to geological shifts, a linear lowland is produced between highlands or mountains called rift valleys. They form hot springs, volcanoes etc.

The correct answer is:

Option C. Rift valleys form where two plates move away from each other.

This can be explained as:

• When the tectonic plates in the lithosphere move apart due to violent forces then the Earth's crust gets torn and a valley like structure is formed.

• These forces make the crust to sink in and a line like structure is formed.

• Rifts can be formed at bottom of oceans as well as on land.

Therefore, rifts are formed due to tectonic plates moving from each other.

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