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Why might geologists collect these sea shells from deep sea sediments that are Pleistocene in age and measure their oxygen isotope ratios?

Why might geologists collect these sea shells from deep-sea sediments that are Pleistocene in age and measure their oxygen isotope ratios? The organisms live near the surface, so their oxygen isotope ratios record surface temperature during Earth’s great climate fluctuations of the ice age.

What is the most valuable non living commodity obtained from sea floor?

Oil and natural gas are the most valuable non-living resources taken from the ocean. Extracting these resources requires drilling into the seafloor.

Which of the following would most likely be covered with thick turbidite layers?

Chapters 9-16
Question Answer
Which one of the following would most likely be covered with thick turbidite layers? deep-sea fan at the base of a continental slope
A flat, bench-like surface cut in rock along a coast is a ________. wave-cut platform
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What is Seamount quizlet?

What is a seamount? An active volcano that occurs along the crest of the mid-ocean ridge. … Seamounts subside as tectonic plates move. Coral reefs grow away from the seamount in order to stay near the sunlight.

Why are abyssal plains more extensive on the floor of the Atlantic than on the floor of the Pacific?

The Atlantic Ocean has the most extensive abyssal plains because it has few trenches to catch sediment carried down the continental slope. The sediments that make up abyssal plains are carried there by turbidity currents or deposited as a result of suspended sediments settling.

What is the source of energy for giant worm tubes and clams that live at hydrothermal vents quizlet?

The sources of energy in these ecosystems are hydrogen sulfide (H2S) and other inorganic chemicals that are abundant in the water that rises from the vents. Some species of bacteria can use these inorganic compounds in chemical reactions to produce sugar and other organic molecules in a process called chemosynthesis.

What non energy seafloor resource is most valuable?

Oil and natural gas are the most valuable non-living resources taken from the ocean. Extracting these resources requires drilling into the seafloor.

Where does the energy come from that drives surface ocean currents like the Gulf Stream?

Large-scale surface ocean currents are driven by global wind systems that are fueled by energy from the sun. These currents transfer heat from the tropics to the polar regions, influencing local and global climate.

What kind of seawater is densest?

Such areas as the Weddell Sea in Antarctica produce the densest water of the oceans. This water, known as Antarctic Bottom Water, sinks to the deepest depths of the oceans.

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?

Which one of the following would you not associate with turbidity currents?

final exam practice
Question Answer
Which one of the following would you NOT associate with turbidity currents formation of seamounts
Which of the following is a tidal current both flood and ebb tide
It is thought that submarine canyons on the continental slope have been generated by turbidity currents

Where would you most likely go to find black smokers deep sea hydrothermal vents )?

Hydrothermal vents in the deep ocean typically form along the mid-ocean ridges, such as the East Pacific Rise and the Mid-Atlantic Ridge. These are locations where two tectonic plates are diverging and new crust is being formed.

What is the main difference between a seamount and Guyot?

A seamount is a submerged volcanic peak that hasn’t ever reached ocean’s surface. Guyots are once active, flat, topped volcanoes that used to be above the ocean surface but the tap was eroded away and it is now submerged.

What is the difference between seamount and Guyot?

Seamounts and Guyots are volcanoes that have built up from the ocean floor, sometimes to sea level or above. Guyots are seamounts that have built above sea level. Erosion by waves destroyed the top of the seamount resulting in a flattened shape. … A seamount never reaches the surface so it maintains a “volcanic” shape. .

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Where is the youngest ocean floor found?

Mid-Atlantic Ocean Ridge
The divergent boundaries are the areas where plates are moving apart from one another. Where plates move apart, new crustal material is formed from molten magma from below the Earth’s surface. Because of this, the youngest sea floor can be found along divergent boundaries, such as the Mid-Atlantic Ocean Ridge.

Why does the Atlantic have more abyssal plains?

One reason for this phenomenon is that the majority of the world’s largest rivers empty into either the Atlantic or the Indian Oceans, providing both ocean basins with an endless supply of the sediments from which abyssal plains are made.

Why are abyssal plains larger and more numerous in the Atlantic Ocean?

Abyssal plains are most common in the Atlantic; in the Pacific, deep trenches around the continents trap most of the sediment before it reaches the open ocean. At depths of thousands of feet, there’s absolutely no light. The water is near freezing, and the pressure is hundreds of times greater than at the surface.

Why does the Atlantic Ocean have the most extensive abyssal plains?

The Atlantic Ocean has the most extensive abyssal plain because there isn’t a Trench to catch the sediment. A convergent plate boundary would be found at a deep ocean Trench. A mid ocean ridge is a divergent boundary.

Which of the following are characteristics of slab pull quizlet?

The following are characteristics of slab pull: Subducting plates move faster than non-subducting plates. Gravity is a major force in slab pull. Subducting oceanic lithosphere is denser than asthenosphere.

Why did the Great Barrier Reef in Australia grow upward?

Why did the Great Barrier Reef in Australia grow upward, forming the largest organic structure on Earth? Sea level rose. … The main feature in the seafloor near Monterey Bay is a large __________ that was partly carved by rivers when the region was above sea level.

What were the key methodologies used to gain an understanding of the undersea geology?

What were the key methodologies used to gain an understanding of the undersea geology of the Gulf of Mexico and the Carribean, in order to reconstruct the region’s history? Seafloor mapping and geophysical surveys conducted for petroleum exploration.

How much gold is there in the ocean?

How Much Is Down There? There is enough gold on the seafloor to give every person alive nine pounds, scientists estimate. That would be worth about $150 trillion, or $21,000 a person.

What is found in the ocean?

The ocean is a continuous body of salt water that covers more than 70 percent of the Earth’s surface. … Seawater’s weight is about 3.5 percent dissolved salt; oceans are also rich in chlorine, magnesium, and calcium. The oceans absorb the sun’s heat, transferring it to the atmosphere and distributing it around the world.

Why is the sea an important resource?

The ocean plays a critical role in removing carbon from the atmosphere and providing oxygen. It regulates Earth’s climate. The ocean is an increasingly important source of biomedical organisms with enormous potential for fighting disease. These are just a few examples of the importance of the ocean to life on land.

What is the main source of energy that drives surface currents?

Surface currents in the ocean are driven by global wind systems that are fueled by energy from the sun. Patterns of surface currents are determined by wind direction, Coriolis forces from the Earth’s rotation, and the position of landforms that interact with the currents.

What causes ocean currents quizlet?

A directional movement of ocean water; surface currents result from steady winds over the ocean surface; deep ocean currents result from density variations due to temperature and salinity differences.

What is the primary energy source of surface ocean currents?

There are two major sources of energy for driving ocean currents: the sun (via wind) and density (via salt content and temperature).

What are the 2 main factors that affect the density of seawater?

The density of seawater depends on temperature and salinity. Higher temperatures decrease the density of seawater, while higher salinity increases the density of seawater.

What processes cause surface seawater to increase in density?

The main processes that increase seawater density are cooling, evaporation, and ice formation. Evaporation and ice formation cause an increase in density by removing fresh water, leaving the remaining seawater with greater salinity (see section 5.3).

What happens to seawater as density increases?

Increasing salinity also increases the density of sea water. Less dense water floats on top of more dense water. … So a layer of water with higher salinity can actual float on top of water with lower salinity if the layer with higher salinity is quite a bit warmer than the lower salinity layer.

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What is the primary reason for the elevated position of the oceanic ridge system?

The primary reason for the elevated position of the ridge system is that newly created oceanic lithosphere is hot and therefore less dense than cooler rocks of the deep-ocean basin.

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.

What feature of the ocean floor develops where the oceanic lithosphere?

Oceanic lithosphere forms at midocean ridges, where hot magma upwells, and then cools to form plates as the material moves away from the spreading center. As the plate cools, heat flow decreases and the seafloor deepens (Figure 3).

Why are turbidity currents important?

Turbidity currents have historically been described as fast-moving currents that sweep down submarine canyons, carrying sand and mud into the deep sea. … Turbidity currents are also important to petroleum geologists because they leave behind layers of sediment that comprise some of the world’s largest oil reserves.

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