Convection currents occur: A:only in liquids

B:when a dense substance is warmer than a less dense substance

C:in both liquids and gases

D:weakly in solids

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

About how much of the cell mass is watet

How can we use spectral lines of light coming from the superclusters to identify which is receding from earth at the slowest rate.