Which is not part of the recipe for a thunderstorm to from?
a. a stationary front
b. rising air
c. moisture in the lower to middle levels of the atmosphere
d. a lifting force

Which of these is the most likely consequence of falling petroleum price

Which would best keep the oxygen cycle stable? a. cutting down jungles to create farmland b. eliminating parks in large cities c. dumping toxic chemicals into the ocean d. reducing the amount of deforestation d. reducing the amount of deforestation

In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). this change in skin color provides evidence that -