Question

what changes cause volcanism, chemical weathering of rocks and the burial of organic matter?
change in the land
changes in the water
changes in carbon dioxide
rewatch

Explanation:

Volcanism releases carbon dioxide, chemical weathering of rocks (like silicate weathering) and burial of organic matter are related to carbon cycle changes. Changes in carbon dioxide drive these processes: volcanic eruptions emit CO₂, chemical weathering can remove CO₂, and buried organic matter stores carbon. "Change in the land" is too vague, "Changes in the water" doesn't directly relate to all three processes.

Answer:

Changes in carbon dioxide