Where is most of the freshwater on Earth? A. glaciers B. groundwater C. lakes D. oceans

Which of the following processes is not used in a conventional method of water treatment? a. filtration b. coagulation c. aeration d. percolation

Which of the following is not an example of point-source pollution? a. oil that is escaping from a damaged tanker b. heavy metals that are leaching out of an underground mine c. water runoff from residential lawns d. untreated sewage that is accidentally released from a wastewater treatment plant

Rising currents of warm air transfer energy from Earth to the atmosphere through _____.

What percentage of Earth's water is fresh water? (a) 3 percent, (b) 10 percent, (c) 50 percent, (d) 90 percent, (e) 97 percent.

What is the average weight of a male Asian elephant in pounds (lbs), if the male Asian elephant weighs on average $4000$ kilograms ?

Why doesn't Earth get hotter as it continues to receive radiation from the sun?

What makes a planet living? Explain your answer by comparing Earth with Mars.

What might happen on Earth if the amount of carbon dioxide in the atmosphere increases? Explain.

In order to simplify timekeeping in locations that are close to each other, Earth is divided into 24 _____.

Minorities Among the residents of Los Angeles, $13\%$ are classified as of Asian descent (Source: U.S. Census Bureau). If an L.A. resident is chosen at random, what is the probability that he or she is

(a) of Asian descent?$\quad$(b) not of Asian descent?

An airplane travels 1500 km/h around the world, returning to the same place, in a circle of radius essentially equal to that of the Earth. Estimate the difference in time to make the trip as seen by Earth and airplane observers. $\it{[Hint:}$ Use the binomial expansion, Appendix A.$]$

What are possible effects of sea level rising due to increased temperatures on Earth?

Which inner planet is the hottest? A. Earth B. Mars C. Mercury D. Venus