Ultramafic Igneous Rocks (Those with Very High Magnesium and Iron

Multiple Choice

Ultramafic igneous rocks (those with very high magnesium and iron, and low silica content) may offer the best hope for improving the environment by

A) being placed on the ocean floor, where they can absorb water and reduce global sea levels.
B) absorbing CO₂, with their rate of absorption capable of being increased by people.
C) pulling ground-level ozone out of the atmosphere as it cools.
D) reducing the rate of salinization of soils when it is ground into a fine powder and sprinkled on the surface.