Oceanography (Grade 10)
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Spring tides are caused by
- the alignment of the moon and the sun 180 degrees.
- the alignment of the moon and sun 90 degrees.
- the alignment of the moon and sun at opposite ends of the Earth.
- the sun's position does not matter because it is too far away.
Which has the greatest effect on changing tides?
- time of the day
- length of the shoreline
- size of the sun
- pull of the moon's gravity
The most common source of energy for surface waves is
Extremely long wavelength, low amplitude ocean waves resulting from submarine earthquakes are called .
- surface waves
- L waves
- orbital waves
Which ocean movement is slow-moving and occurs in deep waters?
- surface currents
- density currents
Which type of seawater has the greatest density?
- warm, with low salinity
- warm, with high salinity
- cold, with low salinity
- cold, with high salinity
Which of the following does NOT affect wave height in deep water?
- wind speed
- wind duration
The most prominent features of the ocean basins are the . They are the mountains of the deep ocean floor.
- continental rises
- hydrothermal vents
- ocean basins
- mid-ocean ridges
A trench is
- undersea mountain chain
- boundary where the ocean and land meet
- V-shaped valley on the ocean floor where old floor is subducted
Which of the following is used to measure ocean depth?
- bottom dredges
- tidal patterns
This layer of the ocean is characterized by rapidly changing temperature.
- the surface layer
- the thermocline
- the bottom layer
- the arctic bottom layer
The movement of the ocean floor on either side of a mid ocean ridge is best known as
- ocean-floor spreading
Each cycle of spreading and magma intrusion along an ocean ridge results in the formation of .
- new ocean crust
- new continental crust
The rising of deep cold currents to the ocean surface is called
Creatures that live in the deep ocean need to adapt to which environmental factor?
- lack of food
- high pressure
- low levels of salt
- high temperatures
Which process does NOT add salt to seawater?
- weathering of continental rock washed to the ocean by rivers and streams
- decay of hard-shelled sea creatures
Island arcs form along
- subduction zones
- rapidly spreading mid-ocean ridges
- transform faults
- wide continental shelves
Organisms that live on the ocean floor are
- sponge bob