Draw the diagrams to show Summer in the Northern Hemisphere and Winter in the Northern Hemisphere.

Seed plants that lived during the carboniferous impact life on earth today because a. they are the ancestors of all plant life on earth. b. their remains formed coal, which is an important resource. c. they produced fossils that are used to date many geologic events. d. their presence caused oxygen levels to drop, allowing animals to evolve.

Which layer surrounds the center of the earth? a: crust b: core c: mantle

Fossils of glossopteris, an extinct fern, were discovered on which continents to support the theory of continental drift? check all that apply.