Crossword-Solution: ISTHMUSES 9 letters, 4 clues 🏆 scrabble score: 14

During a long interval of rest, from the length of time allowed to the above processes, the tendency would often prove effective, both in forming, by accumulation of matter, isthmuses, and in keeping open channels.

The natural route lay obviously through the Caribbean, across some one of the isthmuses, and up the Pacific coast.

One such contingency, though perhaps a remote one, was the possibility of a rival canal, for there are other isthmuses than that of Panama which might be pierced with the aid of modern resources of capital and genius.

During the past year the Navy has, in addition to its regular service, supplied the men and officers for the vessels of the Coast Survey, and has completed the surveys authorized by Congress of the isthmuses of Darien and Tehuantepec, and, under like authority, has sent out an expedition, completely furnished and equipped, to explore the unknown ocean of the north.

Cutting of Isthmuses--Canal of Suez--Maritime Canals in Greece--Canals to Dead Sea--Canals to Libyan Desert--Maritime Canals in Europe--Cape Cod Canal--Changes in Caspian--Diversion of the Nile--Diversion of the Rhine--Improvements in North American Hydrography--Soil below Rock--Covering Rock with Earth--Desert Valleys--Effects of Mining--Duponchel's Plans of Improvement--Action of Man on the Weather--Resistance to Great Natural Forces--Incidental Effects of Human Action--Nothing small in Nature.