What portion of the Earth is covered by water? a. one-quarter
b. one-half
c. three-quarters
d. seven-eighths

Explain why components that are naturally found in air can be considered air pollutants.

The primary agent of contact metamorphism is

Impressions of tropical swamp plants were observed on rocks in polar regions. the impressions were dark black imprints, which means the fossils are examples of ( 1 ) the fossils tell us that polar regions ( 2 ) ( 1 ) a. carbonization b. mineralization c. trace fossils ( 2 ) a. had tropical plants that can grow in ice b. might have had a diffierent climate in the past c. will have abundent vegitation