Which human activities have contributed to an increased abundance of carbon in the atmosphere?
a) producing concrete
b) burning fossil fuels
c) cutting forests and clearing land
d)All of the above
Carbon moves between the atmosphere and the surface of the ocean by the process of.....
a) condensation
b) precipitation
c) transfusion
d) diffusion
When oceanic organisms die,they decompose and become carbon-rich organic matter that deposits on the ocean floor through a process called_______?
a) condensation
b) transpiration
c) sedimentation
d) diffusion
