Reinhard hesse ulrike schacht in developments in sedimentology 2011.
Thickness ocean floor is vs terrestrial.
Or some mixture of these trace amounts of meteoric dust and variable.
The rock cycle is the transition of rocks among three different rock types over millions of years of geologic time fig.
Life cycle of the oceanic crust.
Pelagic sediments are the deposits of the open ocean that accumulate on the ocean floor protected from terrestrial influence see hüneke and henrich 2011 this volume they are not necessarily deep but are usually located at great distance from the continents.
Include the tests of foraminifera shells of pteropods and coccoliths c.
7 56 igneous rock is formed by the cooling and crystallization of molten magma at volcanoes and mid ocean ridges where new crust is generated.
When two plates come together under the ocean a deep sea trench is formed.
Therefore the rate of sedimentation the thickness of accumulated deposits and their quantity if analyzed scientifically help in the reconstruction of the geological history of the world.
All of the above are correct.
However unlike terrestrial plant roots the anchors that some aquatic plants like kelp and sea grass use to secure themselves to the sea floor don t provide nutrients.
Terrigenous sediment is derived from continental sources transported by rivers wind ocean currents and glaciers.
The bulk of the floor s thickness comes from the joists which are the horizontal beams that carry the floor s weight.
This is a more unusual way to categorize ocean floor sediments.
It is dominated by quartz feldspar clay minerals iron oxides and terrestrial organic matter.
This map shows the locations of these deep sea trenches.
Are the most abundant of all biogenous sediments on the ocean floor b.
These relatively narrow down folds in earth s crust may be twice as deep almost 12 000 meters as the regular deep sea floor up to 6 000 meters.
All rocks in earth s crust are constantly being recycled through the rock cycle.
Are found primarily above a depth of 4500 m in the ocean e.
Accumulate at the rate of 1 4 cm per 1000 yrs d.
Instead these aquatic plants absorb nutrients directly from the water around them.
Another classification of ocean floor sediments is by the size of the individual grain.
The various sources of sea floor sediment can be summarized as follows.
2 1 deposition of pelagic sediments.
Clay less than or equal to 4 micrometer silt 4 to 62 micrometer sand 62 micrometer to 2 millimeter and more than 2 millimeter such.
The deposition of sediments on the ocean floor however is a very slow process.
Some also have air bladders that help them to stay afloat.
Joists in home construction are usually made with 2 by 10 or 2 by 12 lumber.
