A train moving at speed of 50km/h. How many hours will it take the train to travel 600km

Ausable water source is one that can be used by humans for drinking or agriculture. identify the water reservoirs as usable or unusable based on their current state. oceans rivers glaciers freshwater lakes groundwater

Many animals cannot sweat to maintain a stable body temperature. what is one other way animals can cool down?

An easy way to calculate the amount of energy available at each level is to what?