What is a mixture? 1. Potassium metal
2. Chlorine gas
3. Potassium Chloride
4. Potassium and Chlorine

if you already have the answer to (a), then just work out how many periods there are in 1 minute, and that's the answer to (c).

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​