Oceans Rise and Fall, Naturally

I watched a news report last night on the PBS News Hour, predicting massive ocean rise as the Glaciers calve or melt in the Antarctic, and with that the risk to areas close to current sea level.

It will be obvious to everyone that I am no expert in glacial ice. My closest approach to a glacier was to fly over an Alaskan glacier in a small plane.

I do know something about history, and I have seen British video about British history. I know, for example that until 1066, British “castles” were mostly Log built Motte and Baille style. You wouldn’t call them Castles in the usual sense of the word, they were wooden forts built on hills, with a wooden wall surrounding a supporting village.

When the French invaded in 1066, they brought with them the modern concept of a Castle, enormous dressed rock forts with 10 foot thick walls, all behind moats and ditches. Some modern castles were built on navigable streams, rivers and even the ocean. The water permitted defense on only three sides, because waterborne attacks were more easily resisted, and rivers and streams permitted fresh water, the Achilles tendon (not “heel”) of all Castles.

To get to the point, the Castles built on waters are now hundreds of yards from the waters they were built upon. The oceans, and navigable waters have changed noticeably since the end of the height of the Castle building, basically 1066 to 1650. Archeologists digging the remnants see the ocean in the distance, or rivers that have become bogs.

What I see with my own eyes on those archeological videos is that oceans rise, and fall. I also read, back when it was first published in 1999, a great book by Dr. Pat Abbott, a professor of Geology at San Diego State, titled Rise and Fall of San Diego. In his book, he said at one time, admittedly millions of years ago, El Cajon was under water.

Those who have served in San Diego know how far inland you can find El Cajon! Now I am certain that human activity contributes to glacial ice melt, but it appears to my untrained eye that it is mostly a natural phenomenon.

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