CH10 Flashcards

(22 cards)

1
Q

Ocean Basins

A

form where two tectonic plates diverge from one another

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2
Q

Mid-ocean Ridge

A

A ridge defines the axis of spreading

-Accumulation of basalt is newly formed oceanic crust

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3
Q

Extent of Ocean Basins

A

Oceans and major bodies of water cover 71 % of Earth’s surface

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4
Q

Ocean Bathymetry

A

mapping the ocean floor using sonar
Sonar waves travel at ~1500 m/sec

Sonar wave is deployed, bounces off ocean floor, and then received by detector

The time interval is used to calculate ocean depth at that point.

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5
Q

Typical Topographical Features of Ocean Basin

A

Continental Shelf: flooded extension of the continent, are gently sloping submerged surface that extend from the shoreline toward the ocean basin.
Continental Slope: a relatively steep zone(compared with the continental shelf), marking the boundary of continental crust and oceanic crust.
Turbidity Currents:Downslope movements of dense , sediment-­‐laden water.
Continental Rise: consists of a thick accumulation of sediment, much of it deposits from turbidity currents; the continental slope merges into the continental rise.
Abyssal Plain: ocean basin floor.

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6
Q

features of ocean basin cont

A

Seamounts: topographic peaks on the seafloor, commonly are remnants of extinct volcanic activity

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7
Q

Mid-Ocean ridges

A

an elevated feature located near the centre of most ocean basins, characterised by extensive faulting and volcanic structures.

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8
Q

Wave

A

generated by surface winds, and transfer energy from one place in the ocean to another

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9
Q

Waves are refracted (bent) as they approach shoreline

A

occurs when part of the wave reaches shallow water first and slows down, while the deeper water portion of the waves maintains a greater velocity.

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10
Q

Beach drift

A

occurs when an uprush of water rich to the shoreline at an angle causes sediment to move in a zigzag pattern along the beach

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11
Q

Longshore current

A

occurs when turbulent water in the surf zone moves in a zigzag motion

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12
Q

Submergent Coast

A

US Atlanac coast and Gulf
Caused by rising sea level or subsiding land.
Tend to have irregular shape, because
the rising sea floods the low reaches of river valleys, producing bays called estuaries.

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13
Q

Emergent Coast

A

US Pacific coast
Result from rising land or falling sea level.
Tend to have wave cut cliffs and
terraces.

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14
Q

Salinity and Density Currents

A

Currents are flows of water and energy caused by wind, water density(controlled by temperature, salinity

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15
Q

Wave density how is it effected

A

When the temperature is high, so is evaporation. Consequently the water density increases
When there is heavy precipitation or high runoff(fresh water), seawater will be diluted (salinity decreases), becoming less dense.

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16
Q

Coriolis Effec

A

influences surface currents; deflects moving water to the right northern hemisphere and to the left southern hemisphere

17
Q

Deep-­‐Water currents

A

result when water of a greater density sinks under less dense water.

18
Q

Density determined by

A

salinity and temperature (greatest effect). Cold seawater with high salinity is densest

19
Q

Deep water circulation begins

A

begins in highest latitudes where water is densest. Surface water becomes dense, sinks, and then travels laterally through the ocean basins in sluggish currents

20
Q

GravitaPonal aQracPon of the Moon cause

A

the daily rise and fall of sea level caused

21
Q

Spring Tides

A

occur when the moon and sun align and create lower, low tides and higher high tides.
(large tidal range)

22
Q

Neap Tides

A

occur when the moon is in the 1st or 3rd quarter phase. Produce lower high tides, and higher low tides.
(Small tidal range)