Oceans Question Preview (ID: 41381)
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When the sea floor spreads apart, volcanoes and ridges are formed because
a) underwater earthquakes lift the sea floor into long ridges
b) ocean water pushes down on the surrounding sea floor, pushing up ridges
c) as the plates pull apart, magma moves to the surface, building ridges
d) sediments are deposited where the floor spreads, building ridges
The scientist credited with sea-floor spreading is
a) Dennis Lieding, a Libertyville social studies teacher
b) Alfred Wegner, a German scientist
c) J. Tuzo Wilson, a Canadian scientist
d) Harry Hess, an American Geologist
In sea-floor spreading, molten material rises from the mantle and erupts
a) along the edges of all the continents
b) along mid-ocean ridges
c) in deep-ocean trenches
d) at the north and south poles
The process by which the ocean floor sinks beneath an deep-ocean trench and back into the mantle is known as
a) continental drift
b) subduction
c) convection
d) conduction
What is the main driving force for surface ocean currents?
a) surface water density
b) temperature gradients
c) salinity gradients
d) prevailing winds
Which two features together control the density of seawater?
a) temperature and salinity
b) temperature and sea depth
c) salinity and plankton concentration
d) salinity and depth
Which is most likely a mountain range
a) a seamount
b) a guyot
c) the abyssal plains
d) the midocean ridge
If the first high tide of the day occurs at 1:00 AM, the next high tide will come closest to
a) 7:00 AM
b) 1:00 PM
c) 7:00 PM
d) 1:00 AM the next day
A wave will increase in height when the distance over which the WIND blows over the sea
a) increases
b) decreases
c) stays the same
d) is 0 kilomters
What is the main cause of the Gulf Stream?
a) storms
b) winds that blow now and then
c) winds that blow in regular direction
d) the moon's gravity
If you were able to walk along the ocean bottom from a beach, which of the following features would you reach after the continental shelf?
a) the abyssal plain
b) a seamount
c) the midocean ridge
d) the continental slope
What causes tides but NOT waves and currents?
a) wind and the moon's gravity
b) mostly the moon's gravity
c) mostly the sun's gravity
d) only winds
About how much of Earth's surface is covered by water ?
a) 0%
b) 30%
c) 70%
d) 100%
From largest to smallest, the amounts of water on Earth are
a) liquid fresh water, solid fresh water, salt water
b) salt water, solid fresh water, liquid fresh water
c) groundwater, salt water, solid fresh water
d) salt water, liquid fresh water, ground water
Which elements(besides hydrogen and oxygen) are most abundant in the oceans?
a) Sodium and Sulfur
b) Sodium and Chlorine
c) Magnesium and Chlorine
d) Sodium and Sulfur
Water in Earth's atmosphere comes mainly from
a) the oceans
b) tropical rain forests
c) underground rivers
d) glaciers
How does the sun play a role in the flow of ocean currents?
a) The sun's radiation directly pushes the ocean currents
b) The ocean currents have no relation to the sun
c) The sun transfers electrons to the ocean and causes it to flow
d) When the sun penetrates the ocean's surface and warms the water, convection currents are created thus causing ocean currents
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