First carried out by Posidonius with a rope and a rock. then they started using sound pulses or echo sounders. Now scientists use multibeam echo sounder systems & satellite altimetry.
#2:
We would be able to locate an active margin around the Pacific. We can locate a passive margin on the Atlantic.
#3:
A shallow, nearly flat continental shelf close to shore. Slope seaward which is steeply sloped. Continental rise, an apron of sediment that blends the continental margins into the deep-ocean basins.
Continental
Oceans
Nearly
Trap
Inhibit
Never
Escaping
No
The
Atlantis
Land
Margins
Across
Reefs
Grow
Idle
Never
Stopping
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