A) the atmosphere.
B) sediments and rocks.
C) land surface, including soils and vegetation.
D) oceans.

A) Most of the carbon is found in the deeper waters.
B) There is relatively little mixing between the ocean surface and the deeper waters.
C) CO₂ dissolves in water due to a concentration gradient between the atmosphere (high concentration) and the ocean (low concentration).
D) The oceanic pool is the most stable of the major pools.

A) 290; billion
B) 390; billion
C) 390; million
D) 404; million