Most Of The Ocean Floor Is Made Up Of Quizlet

The following features are shown at example depths to scale though each feature has a considerable range at which it may occur. This graphic shows several ocean floor features on a scale from 0 35 000 feet below sea level. Oceanic crust is the uppermost layer of the oceanic portion of a tectonic plate it is composed of the upper oceanic crust with pillow lavas and a dike complex and the lower oceanic crust composed of troctolite gabbro and ultramafic cumulates.

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Which groups of elements make up most of the mass of the earth.

Most of the ocean floor is made up of quizlet.

It is further contoured by strong currents along the continental rise. Look at figure 14 23. The survey data was used to create three dimensional relief maps of the ocean floor and by 1953 american oceanic cartographer marie tharp had created the first of several maps that revealed the presence of an underwater mountain range. Oceanic crust is about 6 km 4 miles thick.

Terrigenous pelagic and hydrogenous. The sea floor then drops off steeply along the continental slope the true edge of the continent. It is composed of several layers not including the overlying sediment. Continental shelves are believed to make up 7 percent of the sea floor.

A bathymetric map of the earth s oceans would reveal that most of the ocean floor is made up of. If you follow the ocean floor out from the beach at the top left the seafloor gently slopes along the continental shelf. Alvin was the first u s based deep diving submersible and has now made over 4 400 descents and led to numerous ocean floor discoveries. Terrigenous sediment is derived from land and usually deposited on the continental shelf continental rise and abyssal plain.

The crust overlies the solidified and uppermost layer of the mantle the crust and the solid mantle layer together constitute oceanic lithosphere. What generates earth s magnetic field. You have to apply what you ve learned. The smooth flat regions that make up 40 of the ocean floor are the abyssal plain.

Oceanic crust the outermost layer of earth s lithosphere that is found under the oceans and formed at spreading centres on oceanic ridges which occur at divergent plate boundaries. Shortly after the conclusion of world war ii sonar equipped vessels crisscrossed the oceans collecting ocean depth profiles of the seafloor beneath them. You won t find the direct answer to this in the text. 4 the continental shelf is generally flat and ends at the shelf break where there is a drastic increase in slope angle.

Sealab ii an underwater habitat is lowered off the coast of california. Continental shelf 300 feet continental slope 300 10 000 feet abyssal plain 10 000 feet abyssal hill 3 000 feet up from the abyssal plain seamount 6 000 feet. Iron oxygen silicon and magnesium. There are three kinds of sea floor sediment.

The width of continental shelves worldwide varies from a 30 meters to 1500 kilometers. The fact that only 8 elements out of 112 known elements make up most of the earth is related to the fact that.