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