Generate Explanations

How were Hitler's racial ideas and policies connected to his concept of extreme nationalism?

Oil pollution in the ocean is mostly caused by a. major oil spills, such as the 1989 Exxon Valdez oil spill. b. the cumulative effect of small oil spills and leaks on land. c. decomposed plastic materials. d. intentional dumping of excess oil.

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

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

Which of the following processes is not a part of the water cycle? a. evaporation b. condensation c. biomagnification d. precipitation

List the major types of water pollutants. Suggest ways to reduce the levels of each type of pollutant in a water supply.

Describe three ways that communities can increase their freshwater resources.

List at least three things you can do to help conserve the world's water supply.

What are some things you can do to help conserve the world's water supply? Give at least two examples.

Most of the living species known to science a. are large mammals. b. live in deserts. c. live in the richer countries of the world. d. are insects.

The term biodiversity refers to a.the variety of species on Earth. b. the extinction of the dinosaurs. c.habitat destruction, invasive exotic species, and poaching. d. the fact that 40 percent of prescription drugs come from living things.

How did the Holocaust develop and what were its results?

Give examples of worldwide cooperative efforts to prevent extinctions.

Describe four types of efforts to save individual species.