Quiz 3 Flashcards
(24 cards)
T OR R: Oceanic crust is thicker than continental crust
false
T or F: Oceans are commonly warmer than adjacent land in the winter and cooler in the summer
True
The upward flow of water that carries cold water from the ocean depths to the surface is called
upwelling
Deep-sea currents are driven by______:
A) wind
B) the coriolis effect
c) differences in water density
d) the gulf stream
differences in water density
T or F: Sea levels have risen and fallen repeatedly in the geologic past, and coaslines have submerged throughout earth’s history
True
A glacier that forms in mountainous terrain and convers land area of less than 50,000 square kilometers is a(n)_______ glacier.
A.) alpine
B.) continental
C.) ice sheet
D.) erratic
Alpine
Oeans cover about ____ percent of the earth’s surface
A.) 31
B.) 51
C.) 71
D.) 81
71
Oceanic crust is _______ than continental crust and therefore ________ isostatically.
A.) denser; sinks
B.) denser; rises
C.) lighter; sinks
D.) lighter; rises
denser, sinks
The Mid-Oceanic Ridge rises high above the surrounding sea floor because new lithosphere forming at the ridge axis is ____ and of relatively _____ density
A.) hot; low
B.) hot; high
C.) cool; high
D.) cool; low
hot, low
Most of the water that fills Earth’s oceans come from ______.
A.) the outer regions of the Solar System
B.) the collision with a Mars-sized object that formed the Moon.
C.) volcanoes
D.) a gigantic flood
the outer regions of the solar system
Samples of sediment can be collected from the seafloor using______.
A.) coring devices
B.) echo sounders
C.) seismic profilers
D.) remote sensing
Coring devices
How could the Mid-OCean Ridge system have caused sea level to rise in the past
A.) by bringing up water from the mantle
B.) by spreading rapidly, creating a broader mid-oceanic ridge that displaces seawater
C.) by causing tsunamis during earthquakes
by spreading rapidly, creating a broader mid-oceanic ridge that displaces seawater
What led to the discovery of mid ocean ridges?
A.) the sinking of the titanic
B.) underwater testing of bombs
C.) military maps of the seafloor created during WWII
D.) measurements of ocean depth performed by scientists in the 1920s
military maps of the seafloor created during WWII
T or F: Granite is denser than Basalt
false
T or F: The mid-oceanic ridge syste is Earth’s largest mountain chain
true
Ocean water density depends on
A.) temperature only
B.) salinity only
C.) temperature and salinity
D.) water color
temperature and salinity
The ice sheets of greenland and antarctica contains _____ percent of the world’s ice
A.) 25
B.) 75
C.) 50
D.) 99
99
The Pleistocene Glaciation began about ____ years ago.
A.) 15,000
B.) 2 million
C.) 20 million
D.) 250 million
2 Million
A thick mass of ice that floats on the ocean surface but is connect to and fed from a glacier on land is called a(n)______
A.) ice shelf
B.) iceberg
C.) outwash plain
D.) fjord
ice shelf
T or F: Currently, earth only has two ice sheets
true
T or F: Alpine glaciers are found on every continent on Earth
false
T or F: Pressure from the weight of overlying ice favors melting at the base
true
Cycles identified by Milutin Milankovic are caused by ______
A.) changes in Earth’s tides
B.) increased sunspot activity
C.) variations in Earth’s orbit and spin axis
D.) increased volcanic activity
variations in earth’s orbit and spin axis
T or F: Glaciers form U-shaped valleys
true
