What is the age of the oldest rocks discovered on the planet?

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

If scientists only detect p waves in a certain layer of earths interior what does that tell us?

Fossil fuels such as coal, oil, and natural gas were formed over millions of years by