U1 post assessment

Match it! Select the correct answer from the pull down...Good luck!

What percentage of the earth is covered in freshwater?

What is the main source of our drinking water?

Which of the following is a dangerous mineral to humans and can often cause problems if you eat too much fish that has lived in a contaminated area?

What is a mixture of smoke, fog, and chemicals in the air?

What is the main cause of air pollution

What is a resource that is limited and we cannot make more of is called?

What is the introduction of harmful materials into the environment is called?

DDT is a dangerous ______________ that was used to kill bugs and was found to be harmful to animals and people.