How does seafloor spreading occur? A. By the amount of residual magnetism in a rock sample
B. By the dense oceanic lithosphere that plunge beneath less dense continental
C. From a line along the lithospheric plates that moves past each other
D. Earth persistent magnetic field
E. By the release of magma from the mantle onto the mid-ocean ridge

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