15611207
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What is bathymetry?
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discovery and study of the ocean floor contours
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study of ocean chemical composition
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study of ocean basins
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study to fin the best bath bomb
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Bathymetry started with the [blank_start]Greeks[blank_end], then technology leaped forward with the echo depth sounder in the [blank_start]1900's[blank_end].
The first comprehensive charts of the ocean floor were completed in [blank_start]1959[blank_end].
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Greeks
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Romans
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Chinese
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1900's
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1800's
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1700's
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1959
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1979
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1899
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2009
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What is used to measure ocean depth?
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an echo sounder
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a UV beamer
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satellites
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lasers
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How are satellites used in bathymetry?
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They measure variations in surface elevation (sea surface height).
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They measure variations in ocean depth (ocean floor height).
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They make the figures brightly colored and pretty.
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They provide wifi for the boats using echo sounders.
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Echo sounders send a pulse of sound every [blank_start]10[blank_end] seconds. [blank_start]121[blank_end] beams radiate from the ship's hull and cover a [blank_start]120[blank_end]-degree arc. Echo sounders provide swath coverage.
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10
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20
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121
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171
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120
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160
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Satellites bounce [blank_start]1000[blank_end] pulses of radar energy off the ocean surface every [blank_start]second[blank_end].
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1000
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100
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second
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minute
Frage 7
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More than half of Earth's solid surface is at least 3,000 meters (10,000 ft) below sea level.
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- True
- False
Frage 8
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What is the average depth of the ocean? Average elevation of the continents?
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12,430 ft / 2,760 ft
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2,760 ft / 2,760 ft
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3,546 ft / 1,670 ft
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10,430 ft / 1,760 ft
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[blank_start]Continental Margins[blank_end]: the submerged outer edge of a continent
[blank_start]Ocean Basin[blank_end]: the deep seafloor beyond the continental margin
[blank_start]Mid-Atlantic Ridge[blank_end]: submarine mountain range
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Continental Margins
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Ocean Basin
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Mid-Atlantic Ridge
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[blank_start]Continental Margins[blank_end]: the submerged outer edge of a continent
[blank_start]Ocean Basin[blank_end]: the deep seafloor beyond the continental margin
[blank_start]Mid-Atlantic Ridge[blank_end]: submarine mountain range
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Continental Margins
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Ocean Basin
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Mid-Atlantic Ridge
Frage 11
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Oceanic crust
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Continental Crust
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Oceanic ridges
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Volcanic island arcs, trenches, etc.
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Ocean basin floors
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Continental Rise
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Continental shelves and slopes
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Continental lowlands
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Continental Mountains
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Check all that apply to passive continental margins:
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diverging plates
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litle earthquake and volcanic activity
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surround Atlantic
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converging plates
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lots of earthquake and volcanic activity
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prevalent in Pacific
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Check all that apply to active continental margins:
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lots of earthquakes and volcanic activity
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prevalent in Pacific
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converging plates
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diverging plates
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little earthquake and volcantic activity
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surround Atlantic
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[blank_start]Continental shelf[blank_end]: shallow, flat, close to shore
[blank_start]Continental slope[blank_end]: steeply sloped, seaward
[blank_start]Continental rise[blank_end]: apron of sediment that blends the margin into the deep ocean basin
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Continental shelf
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Continental slope
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Continental rise
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