What is the function of nitrogen- fixing bacteria?
A. They are able to repair damaged nitrogen
compounds.
B. They are able to release nitrogen into the
atmosphere.
C. They are able to take atmospheric nitrogen and
convert it to usable ammonium.
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weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.