Question

what happens to the earths crust as new crust is formed at divergent boundaries? the total crust volume varies randomly. the total crust volume remains constant. the total crust volume decreases.

Explanation:

At divergent boundaries, new crust is formed (e.g., at mid - ocean ridges). Simultaneously, at convergent boundaries, old crust is subducted (pushed down into the mantle). This process of creation and destruction balances out, so the total volume of the Earth's crust remains constant. The option "The total crust volume varies randomly" is incorrect as there is a systematic process. The option "The total crust volume decreases" is wrong because new crust is formed while old is subducted, leading to a balance.

Answer:

B. The total crust volume remains constant (assuming the options are labeled A, B, C with A being "The total crust volume varies randomly", B being "The total crust volume remains constant", and C being "The total crust volume decreases")