1 A) 50% B) 71% C) 85% D) 25% 2 A) The Pacific ocean is deepest and smallest B) The Arctic ocean is shallowest and smallest C) The Atlantic ocean is deepest and largest D) The Indian ocean is shallowest and largest 3 A) Its area is equal to that of the Indian Ocean. B) It contains the deepest trench. C) It is geologically the newest ocean. D) It contains island arcs. 4 A) All continents once were joined into one supercontinent. B) Magnetic anomalies show that the sea floor did not form all at once. C) The oceanic lithosphere is created by sea-floor spreading. D) Sea levels dropped during the Ice Ages 5 A) New volcanic rock pushes them away from spreading centers. B) Cooling lithosphere becomes dense, sinks, and pulls a plate with it. C) Plates crack along fault lines. D) The mantle is fluid and carries plates along with it 6 A) 1,000 atm, 10,000°C B) 10,000 atm, 8,000°C C) 100,000 atm, 6,000°C D) 1,000,000 atm, 4,000°C 7 A) Sea floor spreading B) Movement of the crust C) Currents carrying iron from the core to the crust D) Movement of the outer core 8 A) Bacteria lived in the ocean floor millions of years ago B) Volcanoes form at ocean ridges. C) The sea floor was formed in stripes D) Granite is denser than basalt 9 A) At hydrothermal vents B) Near trenches C) On top of mid-ocean ridges D) Near volcanoes 10 A) Steep ridges B) Thick mineral deposits C) Canyons D) Lots of red clay 11 Siliceous sediments are biogenous oozes formed mostly from shells of microscopic organisms.A) True B) False 12 A) The continental shelf. B) The continental slope. C) The plain. D) Deep-sea fans. E) The abyssal plain. 13 A) True B) False 14 A) True B) False 15 A) Volcanoes are forming. B) Two plates are colliding. C) One plate is moving under another. D) Two plates are sliding past each other. 16 A) Atlantic B) Pacific C) Indian D) Arctic 17 A) It gave rise to the Arctic Ocean. B) It formed between North and South America. C) Today, it is located on the eastern coast of Asia. D) It was home to may shallow-water organisms. 18 A) They always are cut off from the main ocean basins. B) They can contain the greatest average depths. C) They form a continuous body of water around Antarctica. D) They are shallower than the oceans. 19 A) Studying chemistry of the Earth's core B) Producing three-dimensional maps of continental margins C) Producing maps of the positions of ancient continents D) Predicting earthquakes 20 A) True B) False 21 A) Microfossils B) Nitrogenous sediments C) Sulfide compounds D) Siliceous ooze 22 A) Similar rock formations on either side of oceans B) Similar fossils on either side of oceans C) Signs of rising sea levels D) Bands of magnetic anomalies along mid-ocean ridges.
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