Most Of The Ocean Floor Is Made Up Of Quizlet

Iron oxygen silicon and magnesium.

Most of the ocean floor is made up of quizlet.

It is further contoured by strong currents along the continental rise. The smooth flat regions that make up 40 of the ocean floor are the abyssal plain. Terrigenous pelagic and hydrogenous. The crust overlies the solidified and uppermost layer of the mantle the crust and the solid mantle layer together constitute oceanic lithosphere.

It is composed of several layers not including the overlying sediment. Sealab ii an underwater habitat is lowered off the coast of california. Shortly after the conclusion of world war ii sonar equipped vessels crisscrossed the oceans collecting ocean depth profiles of the seafloor beneath them. 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.

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. This graphic shows several ocean floor features on a scale from 0 35 000 feet below sea level. You have to apply what you ve learned. What generates earth s magnetic field.

Continental shelves are believed to make up 7 percent of the sea floor. 4 the continental shelf is generally flat and ends at the shelf break where there is a drastic increase in slope angle. If you follow the ocean floor out from the beach at the top left the seafloor gently slopes along the continental shelf. Terrigenous sediment is derived from land and usually deposited on the continental shelf continental rise and abyssal plain.

You won t find the direct answer to this in the text. The sea floor then drops off steeply along the continental slope the true edge of the continent. Which groups of elements make up most of the mass of the earth. 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.

Look at figure 14 23. 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. A bathymetric map of the earth s oceans would reveal that most of the ocean floor is made up of. Oceanic crust is about 6 km 4 miles thick.

The width of continental shelves worldwide varies from a 30 meters to 1500 kilometers. There are three kinds of sea floor sediment.