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oceanbasins - Physical Geology 101 24 Ocean Basins p...

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Physical Geology 101 1 24. Ocean Basins p. 350-372 Background The majority of the planet is covered by ocean- about _____%. So the majority of the Earth s crust is ____________________. This crust is hidden from view beneath the water so it is not as easily studied as continental crust. It is also not as variable as continental crust, which contains a mix of sedimentary, igneous and metamorphic rocks. Oceanic crust is predominantly made of _______________ and ________________. This makes the oceanic crust denser than continental crust. It is also thinner, so because of isostacy the continents stand higher than the oceanic crust, which forms deep basins filled with water. The four major ocean basins are the Pacific, Atlantic, Arctic, and Indian Oceans. The largest is the ___________ Ocean, which contains ____% of all the water on Earth. Smaller bodies of water called seas may be connected to the oceans, or may be unconnected. Some bodies of water on the continents called seas are actually large lakes because they do not have oceanic crust beneath them (e.g., ________________). The Ocean Floor For much of human history, it was assumed that the ocean floor was a vast, featureless plain. This assumption mostly resulted from the fact that the ocean floor couldn t be observed directly. Is the seafloor really featureless? YES or NO ? We can now image the ocean floor using modern techniques such as: _____________________ and _____________________. The ocean floor contains numerous linear features that attest to the tectonic events that formed the oceanic crust. Much of the sea floor is also covered by sediments that have either been eroded off of the continents, or formed from the precipitation of __________ from sea water, or from shells of marine organisms. The three main components seen along a transect of a typical ocean basin from one continent across the ocean to the next continent are as follows: 1) ____________________________ (closest to the continents) 2) ____________________________ (further away from the continents) 3) ____________________________ (furthest from the continents)
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Physical Geology 101 2 Continental Margins The edges of the sea floor are actually marked by submerged parts of continental crust, where it turns into oceanic crust. These regions are called continental margins.
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