Steeles Royal

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S

shack

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Oct 2, 2001
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C

Ceiling Cat

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Ceiling Cat said:
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His mother had Polynesian ancestry, from Tahiti, through her four great-grandmothers--the mutineers of HMS Bounty sailed from Tahiti to Pitcairn Island, taking some Tahitian women with them. As of 2005, there were an estimated 55 descendants of the mutineers still living on Pitcairn.
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Why Not?

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Ceiling Cat said:

Regardless of elevation, no mountain can be much higher than 29,000 ft because off gravity ( 29,030 highest )
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The Big Island of Hawaii is a free standing mountain over 33,000 feet tall therefore your original statement must be false. By the way your original statement said that the atmosphere limited mountain heights but your answer says that gravity has done it. Your answer is partly correct, gravity does limit mountain heights, but not to 29,000 ft. The atmosphere does not limit it. The limit varies widely from one planet to the next depending on its gravity. Mars has a volcano (Olympus Mons) which is much higher that Everest.
 
C

Ceiling Cat

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Why Not? said:
The Big Island of Hawaii is a free standing mountain over 33,000 feet tall therefore your original statement must be false. By the way your original statement said that the atmosphere limited mountain heights but your answer says that gravity has done it. Your answer is partly correct, gravity does limit mountain heights, but not to 29,000 ft. The atmosphere does not limit it. The limit varies widely from one planet to the next depending on its gravity. Mars has a [HR][/HR] (Olympus Mons) which is much higher that Everest.
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I can not find this 33,000 ft. tall Hawaian mountain of yours on this list of the worlds 25 tallest mountains.

http://list25.com/25-highest-mountains-in-the-world/
 
B

buttercup

Active member
Feb 28, 2005
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Ceiling Cat said:

Regardless of elevation, no mountain can be much higher than 29,000 ft because off gravity ( 29,030 highest )
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Click to expand...
Why Not? said:
The Big Island of Hawaii is a free standing mountain over 33,000 feet tall therefore your original statement must be false. By the way your original statement said that the atmosphere limited mountain heights but your answer says that gravity has done it. Your answer is partly correct, gravity does limit mountain heights, but not to 29,000 ft. The atmosphere does not limit it. The limit varies widely from one planet to the next depending on its gravity. Mars has a volcano (Olympus Mons) which is much higher that Everest.
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Ceiling Cat said:
I can not find this 33,000 ft. tall Hawaian mountain of yours on this list of the worlds 25 tallest mountains.

CC's original point was whether the atmosphere limits how tall mountains can be.

Here's my theory how the atmosphere does in fact limit how tall mountains can be.

The thing that fundamentally limits how tall a mountain can be is the struggle between gravity and the strength of the rock. The higher the mountain, the more its weight makes it bulge and spread at the base, and slump down.

The (extinct) Hawaiian volcano Mauna Kea is only 4000 metres above sea level. But the base of Mauna Kea is 6000 metres below sea level.

The water pressure, down there, is 600 atmospheres (600 bar), pushing in on the rock at the base. So now, the huge water pressure surrounding Mauna Kea squashes the base of the mountain inwards. Or rather, the water pressure provides a large resistance to the tendency of the the mountain to slump and spread itself outwards. The water pressure acts like an iron band wrapped around the base of the mountain.

The base of Mount Everest, on the other hand, is surrounded by air at atmospheric pressure (1 bar) -- which provides zero resistance to spreading and slumping.
Therefore, a mountain with its base in water (at 600 bar) can be taller than a mountain with its base in air (at 1 bar).

The height to which a mountain can grow depends on all sorts of geological factors, strength of rocks, etc, and of course on the force of gravity. But it also depends on whatever pressure is pressing inwards on the base of the mountain. So, the maximum all-land mountain must be smaller than the maximum all-underwater mountain. The maximum for a half-in-air-half-in-water mountain would be half-way between.

Way to go, Ceiling baby! The maximum height to which a mountain can grow is determined by the atmosphere.
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C

Ceiling Cat

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Ceiling Cat said:
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anon1 said:
False.
He's notoriously stingy and has saved his money.
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He is worth at least one or two million, but he is so cheap he has been seen at airports carrying his belonging in garbage bags while he travels to make money for personal appearances.
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