The height from the center line to the crest or trough is called the

Covalent bonds are formed between metals and boiling points true or false

9. the history of life on earth is recorded in

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere