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BC Science 8 Chapter 11
bc science 8 chapter 11 test study guide
Terms in this set (37)
Five Major Oceans, From Largest To Smallest:
The low points in the ocean
What are the orgin of Ocean water
-scientists believe that the oceans are more than 3 billion years old
-water may have originally been released from volcanic eruptions, or arrived on Earth via icy comets.
deep, wide depressions in Earth's surface that contain the oceans
the part of continent that lies under the ocean and includes the continental shelf, the continental slope, and the continental rise.
-edges rising up to the land
the movement of earth's tectonic plates as they float over earth's molten layers
A long underwater chain of mountains rising in the middle of an ocean, created by magma forcing apart 2 oceanic plates.
A new rock is forced up, and the floors spread outward
forms when the dense oceanic plates run into, and slide under the continental plates.
pieces of oceanic crust between a spreading mid-ocean ridge and the trench it disappears into.
The wide, flat part of the ocean lying between the continental margins and mid-ocean ridges. (these make up 30% of the atlantic sea floor, and 65% of the pacific seafloor)
old volcanic mountains found on abyssal plains
*** Turbidity currents
slides on the slopes, and can create large submarine canyons in the shelf
the shallowest part of a continental margin that extends out into the ocean from the shore
an area that drops off rapidly to the ocean basin from the edge of the continental shelf
a deep gully carved in the continental shelf and continental slope by turbidity currents
large amount of ocean water that moves, almost like a river
these transport vast quantities of dissolved minerals, solar energy, oxygen and carbon dioxide all round the planet
Currents are caused by:
salt content, the wind, the spin of the earth, coastlines and the moon
What are the differences between ocean and surface currents?
surface currents are 0-200 m, deep water currents are 200m and deeper
ocean current= large amount of ocean water that moves
surface= influenced by the uneven heating of the atmosphere, spinning of the earth on it's axis and the shape of the earth's land masses
deep current= water temperature and salinity
***What makes currents move
wind, spin of the earth, cariolis, shape of the continents, water temperature, water salinity
masses of air moving rapid area from one area to another because of the temperature difference. as air warns from solar energy, it rises, and cooler air rushes to replace it.
Spin of the Earth
Earth spins from west to east (counter clockwise)
The Coriolis Effect
an alteration of directions in path of winds and current due to earth's spin.
Shape of the Continents
currents move through the oceans and around the continents like rocks in a stream.
Like air, warm water rises, and cool water falls.Dense, cold water tends to sink creating density current. the cool water falls while warm water rises.
Adding fresh water decreases salinity, evaporating a freezing increaces salinity.
***What causes swells
swells are large curling ocean waves. Caused by wind passing over the surface of the water. Swells break in shallow water, show characteristic curl.
made up of harder rock, and erode less, but absorb most wave force.
occur between headlands, are generally calm
*** Sea stack
are extra hard rock left behind from eroded headlands
gravitational attractions between the moon and earth. Because the distance between the moon and the earth change throughout the day, the gravitational pull lenghtens and shortens
*** What is the difference between spring tides and neap tides?
spring tides: are extreme tides produced by the sun's gravity when lined up properly
Neap tides: when the sun and the moon isnt in line, the gravitational pull on earth is ruduced, causing less high tides
The weather characteristics for a specific region averaged over a long time period.
the process of how the thermal rises until it loses its hear, and then drops back down again.
the warm bubbles of air
warm current that develops each year off coast in ecuador, sometimes producing unusual weathers across the world
opposite effect of el nino, colder than normal water coming to the surface off the coast of South America due to the upwelling
How do oceans make cold northern locations warmer? (bc, england, norwat)
Because of the water's high capacity. heat energy is carried from south to north, and evaporates, carryimng energy over the mainland of the province.
Why is the interior colder
mountains block the warmth from reaching into the interior, like edmonton
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