As Hawaiian Lava Flows Age Over 4 Million Years

Multiple Choice

As Hawaiian lava flows age over 4 million years,

A) total soil phosphorous levels decrease.
B) total soil phosphorous levels increase.
C) total soil phosphorous stays about the same, but more phosphorous becomes refractory.
D) total soil phosphorous stays about the same, but more phosphorous becomes weatherable.
E) phosphorous limitation of primary production becomes less important.