When geologists want to study an active earthquake fault, they often rely on a trenching study. ... They brace the walls, if needed, to prevent cave-ins, then they climb down into the trench and carefully map its walls, looking for signs of past earthquakes and ground movement.
Answer:
Drinking
Explanation:
Everyone needs it to drink and therefor regulate the fluids of the body
Brazil has the most area of tropical rainforests
