Which of the following explains why calcareous ooze is sometimes found below the calcite compensation depth CCD )?
Which of the following explains why calcareous ooze is sometimes found below the calcite compensation depth (CCD)? Calcareous ooze can be deposited above the CCD and covered with other sediment, which protects it as the tectonic plate, and the ooze moves into deeper water.
Why are oceanic ridges elevated quizlet?
Where in the oceans are biological communities thriving without sunlight? … Why are mid ocean ridges elevated compared to the surrounding ocean floor? Because newly formed lithosphere is hotter and therefore less dense than the surrounding rocks. Which of the following is not part of an ophiolite complex?
How do ridges form?
A mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. This uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.
Which of the following processes will increase salinity?
Evaporation of ocean water and formation of sea ice both increase the salinity of the ocean. However these “salinity raising” factors are continually counterbalanced by processes that decrease salinity such as the continuous input of fresh water from rivers, precipitation of rain and snow, and melting of ice.
Why are abyssal plains not as well developed in the Pacific ocean as they are in the Atlantic Ocean?
The abyssal plains in the Pacific Ocean has less sediment than the Atlantic Ocean because the sediments from turbidity currents are trapped in submarine trenches that border the Pacific Ocean instead of accumulating on the plain.
Why are abyssal plains more extensive and continuous in the Atlantic Ocean than in the Pacific?
Oceanographers believe that abyssal plains are so flat because they are covered with sediments that have been washed off the surface of the continents for thousands of years. … Abyssal plains found in the Atlantic and Indian Ocean tend to be more extensive than those in the Pacific Ocean.
Why does the rise in the Pacific ocean lack a Rift Valley?
Why does the East Pacific Rise lack a rift valley? The rate of seafloor spreading at the East Pacific Rise is very fast. … Which of the following is a modern example of a continental rift?
Why doesn’t all the siliceous ooze dissolve before it hits the ocean floor?
The surface waters must be nutrient-rich. Why doesn’t siliceous ooze dissolve after it accumulates on the seafloor? Once deposited on the seafloor, siliceous organisms bury each other. What is the approximate depth of the calcite compensation depth (CCD) in the ocean?
Which sediment does not deposit below the CCD?
Calcareous ooze would not be found below the CCD.
What makes a sediment an ooze?
ooze, pelagic (deep-sea) sediment of which at least 30 percent is composed of the skeletal remains of microscopic floating organisms. Oozes are basically deposits of soft mud on the ocean floor.
Why is there such interest in ocean floor nodules?
Polymetallic nodules, also called manganese nodules, are mineral concretions on the sea bottom formed of concentric layers of iron and manganese hydroxides around a core. As nodules can be found in vast quantities, and contain valuable metals, deposits have been identified as a potential economic interest.
Why is ocean exploration bad?
One of the biggest challenges of ocean exploration comes down to physics. … “The intense pressures in the deep ocean make it an extremely difficult environment to explore.” Although you don’t notice it, the pressure of the air pushing down on your body at sea level is about 15 pounds per square inch.
Why is ocean mining good?
Why are there such valuable materials in the deep ocean? Natural hydrothermal geysers on the deep ocean floor regularly vent rich concentrations of metals and minerals from the earth’s core, forming valuable seams on the ocean floor that can yield up to 10 times the precious metals as in comparable land-based mining.
Which sediment does not deposit below the CCD quizlet?
Calcareous ooze would not be found below the CCD.
Why did more calcareous ooze than red clay reach the ocean floor at this location and under these conditions?
F) Calcareous ooze sinks faster than red clay due to its higher density, so there is less time for it to dissolve before it reaches the bottom.
What parts of the ocean do not have calcareous ooze What might be some reasons for this?
Calcium carbonate dissolves readily under pressure and in cold water, therefore deeper ocean floors will have less calcareous ooze. At a depth of about 5 km, the rate of dissolution (how quickly calcium carbonate dissolves) is faster than the rate at which calcium shells are raining down from above.
Why is the oceanic ridge elevated?
Since hot rocks are in a more expanded state and then contract as they cool (as they spread away from the ridge), the midocean ridges stand up high above the surrounding seafloor. The seafloor depth increases with distance away from the midocean ridges.Why are oceanic ridges higher than the surrounding ocean basins?
Why are the mid-ocean ridges higher in elevation than the surrounding ocean floor? Warmer material near the ridge is less dense, so floats higher on the mantle. … An oceanic plate that has been permeated by water before subduction will melt at a lower temperature than a “dry” oceanic plate.
What is the function of the oceanic ridge quizlet?
A mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. This uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.
What is the difference between a ridge and a valley?
Ridge (Also: Arete or Spur) – A continuous elevated terrain with sloping sides. … Valley (Also: Gully, Draw, Couloir) – Long depression in the terrain that has a narrow elevated side and a wide lower opening. A valley can be “V” or “U” shaped and often can be seen as a “negative” to a ridge.What causes tectonic plates to move?
Tectonic shift is the movement of the plates that make up Earth’s crust. … The heat from radioactive processes within the planet’s interior causes the plates to move, sometimes toward and sometimes away from each other. This movement is called plate motion, or tectonic shift.How are ridges formed by tectonic plates?
Mid-ocean ridges occur along divergent plate boundaries, where new ocean floor is created as the Earth’s tectonic plates spread apart. As the plates separate, molten rock rises to the seafloor, producing enormous volcanic eruptions of basalt.
How does salinity affect the ocean?
Salinity can affect the density of ocean water: Water that has higher salinity is denser and heavier and will sink underneath less saline, warmer water. This can affect the movement of ocean currents. It can also affect marine life, which may need to regulate its intake of saltwater.Why does salinity vary in different seas and oceans?
Oceans can vary in salinity by deficiencies/overabundance of fresh water (evaporation/precipitation), as the measure of saltiness is given in the form of a concentration. Salt concentration varies as well because oceans do not stand still. … Search ocean biochemistry for more information.
How do ocean currents affect salinity?
When the water molecules of the ocean become heated, they expand. … Since warmer water thus can hold more salt and other molecules than cold water; it can have a higher salinity. To relate this to ocean currents, the higher the salinity of ocean water, the more dense it becomes.
Why do abyssal plains appear to be absent when a trench is adjacent to a continent?
Abyssal plains are poorly developed or absent adjacent to active continental margins because the ocean trench systems intercept and subduct land-derived sediments into the earth’s mantle (eg. the North Pacific and the eastern South Pacific Oceans).
Why are abyssal plains so flat and featureless?
They are the flattest, most featureless areas on the Earth, and have a slope of less than one foot of elevation difference for each thousand feet of distance. The lack of features is due to a thick blanket of sediment that covers most of the surface.
Do you think that all ocean basins have the same physical features Why or why not?
Ocean basins are the part of Earth’s surface that extends seaward from the continental margins. … Yet, they all contain certain common features such as oceanic ridges, trenches, and fracture zones and cracks, abyssal plains and hills, seamounts and guyots.
Ocean Sediments
Ocean Floor Features
Seafloor Spreading
Explanation of divergent plate boundaries and shield volcano’s
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