An essay on the formation of mountains, [electronic resource] : with a description of that surprizing ridge of black mountains in the north parts of this kingdom; with convincive proofs, that the earth was not thrown on such heaps by the great deluge. Also, reasons explain'd for the springs of hot water coming out of the bowels of the cold earth. Likewise Reasons shewing, why that great Current or Stream always sets in at the Mouth of the Mediterranean, called the Staits of Gibraltar: and that Sea, which has no other Communication with the main Ocean, but at that narrow Passage, is still never the fuller. By Mr. Thomas Hudson.