Kayla is creating a model to show her understanding of the water cycle. She wants to show that water is constantly cycling between the atmosphere and Earth’s surface. What would be the BEST type of model for Kayla to create.

A 3-D model of H2O created with gumdrops and toothpicks.

A. A diagram of molecules gaining energy as they being to evaporate and enter the atmosphere.

B. A poster with pictures of lakes, oceans, rivers and ponds.

C. A circular diagram with arrows showing the movement of water between Earth’s surface and atmosphere.

Hot air balloons float in the air because of the difference in density between cold and hot air. in this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. to do this, use the following variables and make these assumptions: the combined weight of the pilot basket together with that of the balloon fabric and other equipment is w. the volume of the hot air inside the balloon when it is inflated is v. the absolute temperature of the hot air at the bottom of the balloon is th (where th> tc). the absolute temperature of the cold air outside the balloon is tc and its density is ďc. the balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. as always, treat air as an ideal gas. use g for the magnitude of the acceleration due to gravity.

The agent of mechanical weathering in which rock is worn away by the grinding action of other rock particles is call

How have the greenhouse gasses increased from the year 2000 to 2018