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33 Cards in this Set

  • Front
  • Back
how much of the earth is covered by water?
~3/4
ocean currents
gyres
surface currents
fast
deep currents
slow
concentration of dissolved solids
salinity
average salinity of the ocean
35 ppt
as the temperature of the water decreases, the salinity...
decreases and sinks
as depth increases, temperature...
decreases
as depth increases, salinity...
decreases
as depth increases, oxygen...
decreases
as depth increases, carbon dioxide...
increases
4 factors why the sea levels change constantly
tides, waves, currents, weather
calculated from average tidal levels obtained from a large number of gauges
mean sea level
2 reasons why the sea level has been rising
melting of ice and thermal expansion
the change in sea level due to a larger volume of water
eustatic rise
what we can actually observe, the relative rise/drop compared to the coast
relative sea level
the upward/downward movement of the crust based on weight; like a cork bobbing on water; controls relative sea level
isostacy
the median value of the sea level
.48 m
what 2 things control tides?
moon and sun
moon and sun additive effects
large tides
moon and sun subtractive effects
small tides
2 high, 2 low per day; atlantic coast
semi-diurnal tides
1 high, 1 low per day; gulf coast
diurnal tides
random high and low tides; pacific coast
mixed tides
water goes inland
flood tide
water goes out
ebb tide
difference in elevation between high and low tides
tidal range
where does friction begin?
wavelength/2
swash zone
surf
wave approaches shore at an angle; closest part hits shallow water first then slows down; wave approaches shore at lower angle
wave refraction
beach type; short and steep
reflective
beach type; long, flatter, bars
dissipative
generally results from position on tectonic plates; gulf and atlantic coasts
depositional coast