27 Jun bio145 quiz 2
Question
1 of 25 Compared to air, seawater is stable. As a result, physical conditions ______ in the sea.
are always changing
fluctuate wildly
remain relatively constant
change between night and day
are always exactly the same at all depths
QUESTION
2 of 25 The _______ provided by seawater allows marine organisms to reach large size without having a skeleton.
temperature
buoyancy
salinity
transparency
oxygen content
QUESTION
3 of 25 Which of the earth’s layers is considered to be its coolest?
Crust
Mantle
Inner Core
Asthenosphere
Outer Core
QUESTION
4 of 25 Which of the following events removes dissolved oxygen (DO) from seawater?
Photosynthesis
Cellular respiration
Diffusion from the atmosphere
Loss of carbon from living tissue
Death of plankton at the sea bottom
QUESTION
5 of 25 An object will sink in seawater if its density is ______________________.
greater than the density of sea water
less than the density of sea water
the same density as sea water
increasing with seawater depth
decreasing with seawater depth
QUESTION
6 of 25 Places where crust plunges down into the mantle and is destroyed are called ___________ zones.
subduction
spreading
anomalous
tectonic
earthquake
QUESTION
7 of 25 Which of the following statements about the salinity of seawater is FALSE?
Salinity is the total concentration of salts dissolved in the water.
Salinity averages 3.5% for most oceans.
If a person adds freshwater to seawater, the salinity will rise.
Seawater is more buoyant than freshwater.
Seawater tastes salty to humans.
QUESTION
8 of 25 At 4°C_____________.
water will begin to boil
water converts to steam
all life moves more slowly in water
water molecules become more compact down to 2°C
water reaches its maximum density
QUESTION
9 of 25 Hydrothermal vents form as a result of the accumulation of
animals from the deepest parts of the sea.
bodies of dead organisms that accumulate on the bottom of the sea.
rocks and debris dislocated by submarine movements.
various kinds of minerals.
lava as it flows out of cracks in the crust.
QUESTION
10 of 25 Which wavelength penetrates the least distance in water?
Blue
Green
Yellow
Red
Violet
QUESTION
11 of 25 The distance between the crests of two adjacent waves is called the __________.
wavelength
trough
amplitude
period
frequency
QUESTION
12 of 25 The steepest part of the continental margin is known as the
shelf break.
continental rise.
edge of the abyssal plain.
continental slope.
shoreline.
QUESTION
13 of 25 Tides are caused by
patterns of ocean current deflection.
pulses of magma flowing from the center of the earth.
gravitational attraction of the moon and sun.
plates of the earth’s crust rubbing together.
the Coriolis Effect.
QUESTION
14 of 25 The major continents have achieved their present position as a result of a geologic event known as ___.
continental migration
plate movement of land masses
earth-shift dynamic
continental drift
land-mass subduction
QUESTION
15 of 25 There is evidence that the earth and the rest of the solar system formed about
5 million years ago.
1 billion years ago.
4.5 billion years ago.
10.5 billion years ago.
10 million years ago.
QUESTION
16 of 25 The thinnest layer of the earth is the
inner core.
outer core.
crust.
mantle.
asthenosphere .
QUESTION
17 of 25 Which of the following is not true of mid-ocean ridges?
Earthquakes and volcanoes are associated with them.
The sediments get thinner as one moves away from them.
The rock on the sea floor is older as one moves away from them.
Sea floor spreading is associated with them.
All are interconnected.
QUESTION
18 of 25 Which of the following is the factor that most affects wind patterns in the atmosphere of the earth?
Evaporation
Cloud cover
Temperature
Katabatic winds
Gravitational pull of sun and moon
QUESTION
19 of 25 Spring tides are caused by which of the following?
Gravitational attraction of the moon
Gravitational attraction of the sun
Gravitational attraction of the moon and the sun when in line
Gravitational attraction of the moon and the sun when at right angles to each other
Ocean currents
QUESTION
20 of 25 The main thermocline is located at the zone
right above the mixed layer.
between the warm and cold layers.
along the bottom.
below the intermediate layer.
right at the surface in warm tropical water.
QUESTION
21 of 25 How does the oxygen content of the ocean compare to the air that humans breathe?
Higher oxygen content
Lower oxygen content
No significant difference exists
Depends of the salinity of the water
Depends on the depth of the water
QUESTION
22 of 25 Every 4,000 years a significant mixing of water from the depths of the ocean occurs. This mixing is the result of ______________________.
thermocurrent density gradients
tidal shift events
El Niño
surface layer mixing
the great ocean conveyor
QUESTION
23 of 25 The deadliest waves are known as _________________.
submerged waves
tsunamis
electromagnetic waves
surface waves
surging waves
QUESTION
24 of 25 When a wave reaches the shore, _____________________.
the wavelength increases as the depth increases
the time between waves becomes longer
the depth decreases and the wave becomes more smooth
salinity decreases and the wave “breaks”
the wavelength shortens, and the wave becomes higher and steeper
QUESTION
25 of 25 Life around hydrothermal vents depends on
photosynthesis carried on by sea grass and other plants.
oxygen production by surface zooplankton.
food production by chemosynthetic bacteria.
light from the surface coming through tropical thermoclines.
the breakdown of dead phytoplankton drifting down from the surface.
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