Question

thus the total volume of earths crust stays constant. iceland provides a notable example, as it sits on a divergent boundary where the eurasian and north american plates are separating, causing distinct geological features such as rift valley. this makes it a prime location for studying plate tectonics. what happens to the earths crust as new crust is formed at divergent boundaries? the total crust volume decreases. the total crust volume varies randomly. the total crust volume remains constant.

Explanation:

Step1: Identify key - sentence

The first sentence states "Thus the total volume of Earth's crust stays constant."

Step2: Analyze plate boundary info

Iceland is on a divergent boundary, but this doesn't change the overall volume constancy.

Answer:

The total crust volume remains constant.