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What does it mean?

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Coral reefs are underwater structures made from calcium carbonate secreted by corals. Coral reefs are colonies of tiny animals found in marine waters that contain few nutrients.

They are some type of ocean plants.

Fathometer surveys determine water depths by repeatedly transmitting seismic energy through the water column and recording the arrival time of the reflected energy from the water bottom. The instrument calculates the water depth from these data and prints a depth value as a continuous graphic profile. Most fathometers use a narrow bandwidth 200 kHz seismic signal. They provide accurate depth information, but very little information about the subbottom. Fathometers that use a lower frequency, e.g., 20 kHz, can detect reflections from sub bottom interfaces such as the bottom of an infilled scour hole.

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