You would use the word it's in place of the words "it is" because it is a contraction.
If you were to say "It is hot outside today!", you would instead say "It's hot outside today!"
Mark as Brainliest, hope I have helped, and have a good day!!!
<span>When convection currents occur in the air, they cause wind. Local winds, like mountain breezes and valley breezes, stay in a fairly small area. Mountains absorb more heat during the day than the valleys do, so warm air rises off the mountainside.</span>
