Continental crust is typically 40 km 25 miles thick while oceanic crust is much thinner.
The ocean floor is composed of mainly.
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It is composed of several layers not including the overlying sediment.
These vary from oozes made of carbonate from foraminiferal and calcareous phytoplankton and some silica that has settled through the water column.
The following features are shown at example depths to scale though each feature has a considerable range at which it may occur.
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The crust overlies the solidified and uppermost layer of the mantle the crust and the solid mantle layer together constitute oceanic lithosphere.
Continental crust is broadly granitic in composition and with a density of about 2 7 grams per cubic cm is somewhat lighter than oceanic crust which is basaltic i e richer in iron and magnesium than granite in composition and has a density of about 2 9 to 3 grams per cubic cm.
Cosmogenous sediments are the remains of space debris such as comets and asteroids made up of silicates and various metals that have impacted the earth.
Oceanic crust is about 6 km 4 miles thick.
Chapter 14 the ocean floor the vast world ocean ocean floor features seafloor sediments resources from the sea floor.
Biogenous sediment composed of the silica based shells of single celled animals and algae.
The ocean floor is made of mostly brainly.
The topmost layer about 500 metres 1 650 feet thick includes lavas made of basalt that is rock material consisting largely of plagioclase and pyroxene oceanic crust differs from continental crust in several ways.
It is thinner denser younger and of different.
Known as manganese nodules they are composed of layers of different metals like manganese iron nickel cobalt and copper and they are always found on the surface of the ocean floor.
Round lump of hydrogenous sediment scattered on the ocean floor consisting mainly of manganese and iron and.
Silicates mostly compounds made of silicon and oxygen are the most abundant rocks and minerals in both oceanic and continental crust.
One of a series of small rolling hills on the ocean floor that occur next to continental margins or ridges.
A large flat area on the ocean floor composed of sediements that originated mostly on continents.
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.
This graphic shows several ocean floor features on a scale from 0 35 000 feet below sea level.
Oceanic crust oceanic crust extending 5 10 kilometers 3 6 kilometers beneath the ocean floor is mostly composed of different types of basalts.
In the deepest parts of the.
