| 21. | It had a depth of 60 miles below the sea floor.
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| 22. | The sea floor contains Paleozoic and Mesozoic granite and metamorphic rocks.
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| 23. | Lots of porcelain shards were found strewn over the sea floor.
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| 24. | The sea floor elsewhere in the Mediterranean holds countless archaeological sites.
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| 25. | _Large amounts of gas hydrates, ice-like forms of methane, on the sea floor.
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| 26. | Pipes will run through the 705-foot-long cylinder to wells on the sea floor.
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| 27. | In the calcium carbonate coral layers, he could read the sea floor's history.
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| 28. | The sea floor off the mid-Atlantic coast has a bad case of indigestion.
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| 29. | We know certain types lived in water and others at the sea floor.
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| 30. | Scallopers, leaving no profit untouched, leave a lifeless rubble on the sea floor.
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