e18.    Does water recover from pollution?

Streams recover rapidly from degrading oxygen demands, and excess heat by dilation and bacterial decay. Lakes and reservoirs are less effective at self-cleaning because of little vertical mixing. Lakes are more vulnerable to contamination. Costal areas, wetlands, estuaries, mangrove swamps, and coral reefs are the most susceptible to pollution.

g14.    How can global warming affect sea levels?

g16.    What is matter?

g25.    What are the properties of water?

g26.    Where is drinkable water found?

g27.    How fast are supplies of mineral being used up?

m15.    How are freshwater and marine environments managed?

m31.    Is nuclear energy a viable alternative?

m43.    Are pesticides regulated?

m46.    How do pesticides impact the environment?

m48.    What is in pesticides and what do they do?

m49.    Is there legislation regarding water pollution?

m50.    What other types of pollutants are there?

m51.    Where do pollutants come from?

m59.    How do diapers affect the environment?

m63.    What can be done to reduce waste and pollution?

m77.    How is water used?

m78.    How do droughts and floods impact populations?

m79.    Where are our water supplies? 

m80.    How can we protect our water supplies?

m81.    How can we increase our water supplies?

m82.    How can we conserve our water supplies?

m86.    How can water help feed us?