What is the biggest problem facing pompeii today?

Which factors add to the greenhouse effect and are caused by human activities?

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

Scientists think that convection currents flow in earth’s a. continents. b. mantle. c. lithosphere. d. inner core.