5. if you were a paleontologist who studies fossils of very ancient life forms, where would be the best place to look for very old fossils: on land or in the oceans?

6. imagine that earth’s magnetic field was fixed in place and the polarity didn’t reverse. what effect would this have on our observations of seafloor basalts?

7. look at a map of the atlantic seafloor with magnetic polarity stripes and recreate the history of the atlantic ocean basin.