Which best describes the composition, or make-up, of clouds?
a) they are made of heated air.
b) they are made of air pollution.
c) they are made of tiny droplets of water.
d) they are made of carbon dioxide and oxygen.

Which property of fossils allow scientists to determine the relative rock ages..

50 g of ice at 0°c is dropped in a beaker containing 100 g of water at 0°c. what will be the contents of the beaker after 5 hours? assume that the room temperature is 0°c.

Agas contained within a piston-cylinder assembly undergoes three processes in series: process 12: compression with pv= constant from 1 bar and 1 liter to 4 bar. process 23: constant pressure expansion to 1 liter. process 31: constant volume calculate the pressure and volume at each state, and sketch the processes on a p-vdiagram labeled with pressure and volume values at each numbered stat