You won t find the direct answer to this in the text.
Most of the ocean floor is made up of quizlet.
You have to apply what you ve learned.
The fact that only 8 elements out of 112 known elements make up most of the earth is related to the fact that.
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.
If you follow the ocean floor out from the beach at the top left the seafloor gently slopes along the continental shelf.
A bathymetric map of the earth s oceans would reveal that most of the ocean floor is made up of.
Sealab ii an underwater habitat is lowered off the coast of california.
Iron oxygen silicon and magnesium.
What generates earth s magnetic field.
The crust overlies the solidified and uppermost layer of the mantle the crust and the solid mantle layer together constitute oceanic lithosphere.
This graphic shows several ocean floor features on a scale from 0 35 000 feet below sea level.
It is further contoured by strong currents along the continental rise.
The width of continental shelves worldwide varies from a 30 meters to 1500 kilometers.
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.
The following features are shown at example depths to scale though each feature has a considerable range at which it may occur.
Terrigenous sediment is derived from land and usually deposited on the continental shelf continental rise and abyssal plain.
Continental shelves are believed to make up 7 percent of the sea floor.
The sea floor then drops off steeply along the continental slope the true edge of the continent.
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.
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.
Oceanic crust is about 6 km 4 miles thick.
It is composed of several layers not including the overlying sediment.
4 the continental shelf is generally flat and ends at the shelf break where there is a drastic increase in slope angle.
Shortly after the conclusion of world war ii sonar equipped vessels crisscrossed the oceans collecting ocean depth profiles of the seafloor beneath them.
Look at figure 14 23.
Which groups of elements make up most of the mass of the earth.
