1. Used as a solvent 2. The major constituent of natural gas.

3. Vinegar when in a diluted form.

4. Used in the manufacture of polyethylene plastic

Match the compounds below to their correct uses from above:

37.C2H4

38. CH4

39. CH3OH

40. CH3COOH

Which statement is a reason to support population regulation? a) it is unethical for us to control birth control rates b) humans have the freedom to produce as many children as desired c) the gap between the rich and poor has been narrowing since 1960 d) billions more people on the earth will intensify many environmental and social problems

Write a paragraph that provides examples of each stage of volcanic activity, a description of the volcano, and facts about each stage.

How are isotopes of the same chemical element alike? how are they different?