Kevin walks his dog 45 meters to the west, 65 meters east, 10 meters west all in 20 minutes what was Kevin's speed what was Kevin's velocity

What are chlorofluorocarbons and what impact do they have on the atmosphere?

In a system, when potential energy decreases, then entropy also decreases. true false

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix. b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds. c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer. d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.