Thickness Ocean Floor Is Vs Terrestrial

Or some mixture of these trace amounts of meteoric dust and variable.

Thickness ocean floor is vs terrestrial.

Reinhard hesse ulrike schacht in developments in sedimentology 2011. This map shows the locations of these deep sea trenches. It is dominated by quartz feldspar clay minerals iron oxides and terrestrial organic matter. 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.

The bulk of the floor s thickness comes from the joists which are the horizontal beams that carry the floor s weight. Joists in home construction are usually made with 2 by 10 or 2 by 12 lumber. Accumulate at the rate of 1 4 cm per 1000 yrs d. 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.

These particles consist primarily of either the microscopic calcareous or siliceous shells of phytoplankton or zooplankton. Another classification of ocean floor sediments is by the size of the individual grain. Are the most abundant of all biogenous sediments on the ocean floor b. 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.

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. When two plates come together under the ocean a deep sea trench is formed. This is a more unusual way to categorize ocean floor sediments. Terrigenous sediment is derived from continental sources transported by rivers wind ocean currents and glaciers.

Life cycle of the oceanic crust. The size is from the smallest to largest these are. 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. All rocks in earth s crust are constantly being recycled through the rock cycle.

The rock cycle is the transition of rocks among three different rock types over millions of years of geologic time fig. 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 of the above are correct. Are found primarily above a depth of 4500 m in the ocean e.

Instead these aquatic plants absorb nutrients directly from the water around them. The deposition of sediments on the ocean floor however is a very slow process. The various sources of sea floor sediment can be summarized as follows. Include the tests of foraminifera shells of pteropods and coccoliths c.