Question

1. the mantle is primarily composed of silicate minerals. which two elements are more abundant in the mantle compared to the crust? silicon and aluminum magnesium and iron oxygen and nitrogen carbon and calcium

Explanation:

To solve this, we recall the composition of Earth's mantle and crust. The mantle is rich in silicate minerals with more magnesium (Mg) and iron (Fe) compared to the crust (which has more silicon, aluminum, etc.). Silicon and aluminum are more abundant in the crust. Oxygen is abundant in both but not the key difference here. Carbon and calcium are not the main abundant elements in the mantle relative to the crust. So the correct pair is magnesium and iron.

Answer:

B. Magnesium and iron