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Re: Cables, the debate
- To: aquatic-plants at actwin_com
- Subject: Re: Cables, the debate
- From: Andrew McLeod <thefish at theabyssalplain_freeserve.co.uk>
- Date: Wed, 04 Jun 2003 10:09:58 +0100
- In-reply-to: <200306031605.h53G5UlZ032000@otter.actwin.com>
- References: <200306031605.h53G5UlZ032000@otter.actwin.com>
- User-agent: Opera7.11/Win32 M2 build 2880
Humm, I know of a spring here in Florida called Warm mineral springs(Warmmost underground warmth, that causes warm mineral springs etc, does not
come from magma except in active volcanic areas (Iceland, Yellowstone Park)
. Most is simply caused by the geothermal gradient. Firstly, rock
temperature at a depth of only 30 feet or less at are effectively constant,
regardless of seasonal changes, so some people use boreholes to provide
warmth in winter. Secondly, the average geothermal gradient of the Earth's
crust is about 1 degree celcius per 100 foot, so water would be boiling
10000ft down. Secondly, some areas of the world have much steeper
geothermal gradients, caused by radioactive decay of trace isotopes in
relatively new rocks such as recent granites and recent sedimentary rocks.
In fact, radioactive isotopes such as potassium, radium and uranium in the
crust and upper mantle provide most of the heat for all the volcanism on
Earth, which is (relatively) shallow.
hardwater/high CO2), they have a few plants but they don't grow where the
water perculates up through the substrate. They did find some 12,000yo
Indian and saber tooth bones/remains. It's a neat spring, deep, good for
scuba, bad for plants. Water is fairly warm vs the average spring here.
Some springs go very deep here and some also in other regions do go very
Sure, not ALL
ecosystems are like this, but maybe some places have warm groundwater
seeping UP from below the substrate. The sun is not directly involved
this - consider magma (magna?) near the surface.
Really? How much magma would I dose?:-)
I'm using Florida as an example since it has year round plants, 100'S of
springs with brackish, fresh water w/soft, medium and hardness, sulfur,
warm, most are around 68-73F year round, no variation to speak of
temperature/chemical wise. This makes them ideal natural experiment
But in the winter, the spring is warm compared to the surrounding air but
the water temp stays very constant regardless.
This is one reason I want folks to come here to see all the variation in
habitat and wonder why this might be. 8000 lakes, many rivers/streams.
Most with plants, no winter ice etc.
From what I have learned doing 2 years of A-level Geology (i.e. not a lot),
I am not, however, suggesting that we replace heating coils with strips of
thefish at theabyssalplain_freeserve.co.uk