Juan and Cindy are getting ready to go to prom. Cindy is lowering the temperature on the old, leaky air
conditioning unit that emits freon gas (CFCs). Juan, her date, is coming to pick Cindy up in his 4 ton Truck-a-
Saurus, which burns a lot of gas. The Truck-a-Saurus is fuel efficient at a rate of 2.3 miles per gallon. Cindy's
Per
father, Earl, is clearing a 500 acre forest behind their house in order to plant pole beans.
BORGES
ecce
BENESS
After Juan arrives, the three of them get into a heated argument about the environment. They each accuse the other of
contributing to ozone depletion and causing Earl's dog, Roscoe, to get skin cancer. Explain who is most guilty and why.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

looks like the answer is     c     to me!

d. organisms have cells with different shapes and functions.

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.