g08.    What are the spheres that make up the earth?

The atmosphere (air) is made up of two principle elements: nitrogen and oxygen.

The hydrosphere (water) is made up of two principle elements: oxygen and hydrogen.

The lithosphere (earth) is made up of four principle elements: oxygen, silicon, aluminum and carbon. The deeper into the lithosphere you go, the hotter it gets; the deepest drilled hole is 5 miles deep.

e02.   Where is life found in the water?

e16.    What do computer models of greenhouse changes show?

e17.    How do organisms use matter?

e19.    What materials can cause water pollution?

e23.    How is soil important to plants?

m01.    How much public land is there and how is it used?

m15.    How are freshwater and marine environments managed?

m26.    How is hydroelectric power used?

m27.    How is electricity from wind used?

m33.    How does global warming affect climate?

m35.    How can global warming affect biodiversity?

m49.    Is there legislation regarding water pollution?

m52.    What causes air pollution?

m55.    What are the environmental impacts of using up our mineral resources?

m64.    How much ionizing radiation are we exposed to?

m74.    How is soil important in the environment?

m77.    How is water used?

m82.    How can we conserve our water supplies?