Rift Valleys are:

Rift Valleys are:

• A. Places on Earth's surface where the crust stretches until it breaks
• B. Deep trenches formed by subduction
• C. Mountain ranges formed by collision
• D. Wide plains formed by sediment deposition

Answer: (A)

Rift valleys form at places where the Earth's crust is being pulled apart. When tectonic plates diverge, the crust stretches and thins, causing cracks to form along normal faults. As blocks of crust drop down between these faults, a long, lowered valley appears—the rift valley. This thinning and breaking of the crust is the key process behind rift valleys, and you can often see related volcanic activity as magma rises through the thinner crust. In contrast, deep trenches arise from subduction at convergent boundaries where one plate dives beneath another, and mountain ranges form from the uplift that occurs when plates collide. Wide plains formed by sediment deposition don’t involve the crust breaking due to stretching in the same way. So the defining description of a rift valley is indeed the crust stretching until it breaks.

Rift valleys form at places where the Earth's crust is being pulled apart. When tectonic plates diverge, the crust stretches and thins, causing cracks to form along normal faults. As blocks of crust drop down between these faults, a long, lowered valley appears—the rift valley. This thinning and breaking of the crust is the key process behind rift valleys, and you can often see related volcanic activity as magma rises through the thinner crust.

In contrast, deep trenches arise from subduction at convergent boundaries where one plate dives beneath another, and mountain ranges form from the uplift that occurs when plates collide. Wide plains formed by sediment deposition don’t involve the crust breaking due to stretching in the same way. So the defining description of a rift valley is indeed the crust stretching until it breaks.