oceans exam 2
4
A tidal day is 1. 12 hours. 2. 12 hours and 25 minutes. 3. 24 hours. 4. 24 hours and 50 minutes
1
A wind blowing from the northwest to the southeast is called a ______ wind. 1. northwest 2. northerly 3. southeast 4. southerly
1
Diurnal tide cycles occur 1. once a day. 2. twice a day. 3. three times a day. 4. only at low latitudes.
1
If two surface water types with the same density but different salinities and temperatures mix, the resulting water will be 1. denser than both parent types. 2. less dense than both parent types. 3. denser than the denser parent type. 4. the same density as the parent types
3
In the Northern Hemisphere, the water surface of the open ocean moves 1. at right angles to the wind. 2. parallel to the wind. 3. 45 degrees to the right of the wind. 4. 45 degrees to the left of the wind
2
In the middle latitudes of the Northern Hemisphere, a _____ pressure cell develops over the ocean in winter and a ____ pressure cell develops in summer. 1. high; low 2. low; high 3. low; low 4. high; high
eddies
Meanders in the Gulf Stream current can pinch off to form warm and cold core
2
The Coriolis effect arises primarily from the 1. curvature of Earth's surface. 2. rotation of Earth around its axis. 3. rotation of Earth around the sun. 4. effect of winds high in the atmosphere.
4
The average movement of all water affected by the wind is ______ degrees to the ______ of the wind motion in the Southern Hemisphere. 1. 45; right 2. 45; left 3. 90; right 4. 90; left
2
The average salinity of the oceans is about ______ parts per thousand (‰). 1. 30 2. 35 3. 37 4. 40
1
The low pressure area near the equator is known as the 1. Intertropical Convergence Zone. 2. horse latitudes. 3. westerlies. 4. trade winds
4
The major ionic constituents of sea salt are normally found to 1. have a constant ratio of each constituent to each other. 2. behave as conservative materials. 3. have the same ratio to each other even when diluted by rainwater. 4. All of these are correct. 5. None of these are correct.
3
The orbital motion of a deep water wave extends to a depth equal to 1. twice the wavelength. 2. the wave's height. 3. one-half the wavelength. 4. one-half the wave's height. 5. the seafloor depth
true
The period of a wave never changes
false
The pycnocline of the oceans is usually found at depths exceeding 2000m
Redfield
The relative molar abundance of carbon, nitrogen, and phosphorus in marine phytoplankton can be expressed in a relationship called the ___ ratio
capillary
The restoring force for ___ waves is surface tension
3
The speed of the Florida current is high because 1. the winds are strong at this latitude. 2. the water has a high salinity. 3. the channel through which it flows is narrow. 4. the Coriolis effect is large. 5. None of these are correct; it is a slow current.
false
The sun plays a greater role in producing the tides than the moon
2
The winds that begin the polar high pressure zones are called 1. polar westerlies. 2. polar easterlies. 3. westerlies. 4. easterlies. 5. northerlies and southerlies (depending on the pole).
4
Thermohaline circulation is driven by changes in 1. surface tension. 2. convection. 3. pressure. 4. density
windspeed, wind direction, fetch
Wave height of wing waves depends on what three factors?
2
What ion is most important for buffering pH in the ocean? 1. HCO3- 2. CO32- 3. OH- 4. H+
4
Which ion has the shortest residence time in the oceans? 1. Chloride 2. Sodium 3. Sulfate 4. Iron
3
___ tides occur at the first quarter moon. 1. Mixed 2. Diurnal 3. Neap 4. Spring
true
t/f In the Southern Hemisphere, the atmospheric low pressure belt centered on 60S remains nearly continuously around the world at all seasons of the year.
false
t/f Nutrients and dissolved gases in seawater are considered conservative substances
