Peaceful anti-government demonstrations in 1989 effectively brought about change in czechoslovakia during the a. dissolution b. civil war c. velvet revolution d. islamic revolution

What season is it in the southern hemisphere when it’s december? a) fall b) spring c) winter d) summer

What is the result of the greenhouse effect? a. heat is deflected from the atmosphere. b. heat is released from the atmosphere. c. heat is kept in the atmosphere. d. plants are able to grow in the tropics where the air is the heaviest.

Which of the following types of nonrenewable fuel sources requires the storage of radioactive waste? a. coal b. nuclear c. solar d. oil