Asharp knife cuts things easily. give reason

If you cut with a sharp blade and a blunt blade, using the same force with each. The sharp blade has a much smaller surface area than the blunt blade. This results in the sharp blade translating that force into more pressure at the cutting surface, and therefore an easier cut.
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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.​

the second one and the forth one are in the purple because they are opinions and the rest are in the yellow

explanation: