Beneath Some Valleys in East Africa and in a Large

question 11

Multiple Choice

Beneath some valleys in East Africa and in a large area called the Basin and Range Province in the western United States and northern Mexico, the crust ____.

• A)appears to be in the initial stages of rifting
• B)appears to have undergone numerous earthquakes in the last 1000 years
• C)is much thicker than it is in the surrounding areas
• D)is composed mostly of basalt
• E)is composed of fragments of extinct volcanoes

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