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37 Cards in this Set
- Front
- Back
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Why is the ocean salty?
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....because minerals are washed out from land
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salinity
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amount of salt in water
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water pressure
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downward push of water
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How are water depth and pressure related?
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water pressure increases as you go deeper, because more water goes down.
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What are three details that describe conditions deep in the ocean?
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-temperature is low
-there is no light -water pressure is very high |
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How is ocean floor like land?
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some parts are flat, some parts are slope y, some parts are like mountains
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continental slope
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the part of the ocean floor that slopes steeply
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continental shelf
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the part of the ocean floor that drops gently
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what formed the deep canyons in the continental slope?
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large rivers flowing into the ocean
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How is the continental rise formed?
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sentiment piles up at the base of the continental slope and forms the continental rise
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abyssal plain
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a large flat area of the ocean floor
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what are three features found on the abyssal plains?
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-mountains
-trenches -mid-ocean ridge |
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what are three main ways islands in the ocean can change?
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-can be built up by volcanic eruptions
-can be worn away by ocean floors -coral reefs can form around it |
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wave
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the up and down movement of surface water
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How does wind moving over the surface of water effect it?
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it causes the surface of water to move with it
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In a wave what moves forward across the surface of water?
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energy
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what happens to waves as they approach the shore?
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the waves slow down, become higher and closer together
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what is a storm surge?
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a moving of water pushed onto shore by a hurricane
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how is a tsunami different from all other waves?
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it is caused by an earthquake or erupting volcano while other kinds of waves are caused by winds
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current
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a stream of water that flows like a river through the ocean
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how does an ocean current differ from a wave?
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an ocean curent is not easily seen, and it moves water forward, sometimes for long distances.
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what is a surface current and what causes it?
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surface current is a large ocean current that flows across the surface of the ocean, caused by moving air winds.
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tide
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rise and fall of the water of the ocean
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what causes tides?
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the pull of the moon/sun
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why does the moon effect tides more than the sun?
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it is closer to the earth
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how is high tide different from low tide?
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the level of the ocean is higher it bulges causing high tide. the parts of the ocean between the ocean is low tide.
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shore
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area where the ocean and land meet/interact
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headland
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when soft rock is worn away, the hard rock left behind forms a point of land
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tide pool
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temporary pool of ocean water
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what is an estuary?
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where a river flows into the ocean
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how do people restore beaches?
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by filling in sand/making a jetty
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jetty
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a wall like structure that flows out into the ocean
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Name two kinds of near-shore currents:
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-rip current
-long shore current |
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what is the difference between a surface current and a deep-ocean current?
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a surface current flows across the surface of the ocean while the deep-ocean current carry cooler water up toward the surface ner the coast
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How is the surface current different from the current near the coast?
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surace currents carry water great distances across the surface while the current near the coast erode and deposit sand helping to shape beaches
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how do waves effect a shoreline?
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waves change the shape of a shore line, by taking away sand and wearing away rock
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what are two problems caused by beach erosion?
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-it makes some beaches smaller
-it fills in channels , which then become too shallow for boats to pass through |
