Which of the following was classified as an ocean most recently? a. the indian ocean b. the southern ocean c. the pacific ocean d. the atlantic ocean

Volcanic irruption is most likely to be violent when a) volcanoes near to the sea b) the neck of the volcano is sealed by a plug c) the lava is viscous d) the lava reaches the surface through a fissure e) the volcano is on the ocean floor

In the following diagram, four different index fossils are labeled: which of the labeled fossils comes from the oldest organism? a b c d

The vegetation that thrives in the tundra is limited to a. mosses, barley, wheat, and corn. b. coniferous trees. c. dwarf shrubs, mosses, lichen, potatoes, and beans. d. mosses, lichen, algae, and dwarf shrubs.