Answer:
In a global convection cell less –dense air at the equator rises and flows towards the poles. And from pole, the dense air sinks down and flows back towards the equator.... This movement of air is also supported by the Earth's rotation known as Coriolis Effect.
NO. although the arrangement of the atoms will change, the total number stays constant.
4*5=20; ration of 20:25,
20/25= %80