Describe DDT and summarize the history of the use and banning of DDT, including actions taken by the US government. State the major reasons for spraying DDT and for banning it. State three or more ways science has played a role in the controversy.

What percentage of light hits earth's surface directly?

Which two criteria must be met before scientist can use radiocarbon dating? explain your answer

Describe the change in phase and temperature as water moves from the oceans to the atmosphere and then returns to earth again as rain. a) evaporation : temperature increases; condensation : temperature decreases; precipitation (rain) : temperature decreases b) evaporation : temperature increases; condensation : temperature decreases; precipitation (rain) : temperature increases c) evaporation : temperature decreases; condensation : temperature decreases; precipitation (rain) : temperature decreases d) evaporation : temperature increases; condensation : temperature increases; precipitation (rain) : temperature decreases