Answer: I think that it would be C because blooms are due to eutrophication, which means that there are high levels of phosphate in the water. Phosphate is a main ingredient in pesticides, which can run-off into rivers.
A fault is found that cuts through lower rock layers but not those above it. What can most likely be concluded? The fault is the same age as the layers it cuts through, and the same age as the layers above it.
