XPost: alt.astronomy, alt.fan.heinlein
On 6/21/24 13:47, Jim Wilkins wrote:
"a425couple" wrote in message news:wCjdO.104756$iz_6.82118@fx14.iad...
A big whack that made the moon may have also created continents that move
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https://en.wikipedia.org/wiki/Alfred_Wegener
In 1912 he presented his theory that continents drift around and were
once assembled. After his death the Nazis picked up on and promoted it,
which tainted the concept so much that it was buried, and only
resurrected when a grad student independently noticed and popularized
the proposal and thus freed it from its political stigma.
When I studied Earth Science in the 1950's the standard explanation of mountains made no sense. There was a lot of material on Louis Agassiz
but no mention of Wegener.
OK.
Frustrating, that the name connected to a theory has so much weight
on the consideration given to that theory.
The current talk, that because it is so much smaller, Mars interior
cooled so many Billions of years before ours (and thus lost
tectonic movement and magnetism, and thus water,,,) seems
kind of lacking to me.
I read:
AI Overview
Learn more
…
The Earth's core has remained hot for billions of years due to a
combination of factors, including:
Radioactive decay
Isotopes like potassium-40, uranium-235, uranium-238, and thorium-232
are unstable and release energy that converts to heat, contributing up
to 90% of the Earth's internal heat.
Heat from formation
When the Earth formed around 4.5 billion years ago, it accreted from a
disk of hot, spinning material, generating a lot of heat through
collisions. This heat accounts for 5–10% of the Earth's core heat.
Frictional heating
Denser core material sinking to the center of the planet creates
friction, which also generates heat.
Solidifying outer core
As the liquid outer core solidifies near its boundary with the inner
core, it releases heat.
Latent heat
As the Earth cools, the core expands and releases heat into the mantle.
National Geographic Education
Core - National Geographic Education
The primary contributors to heat in the core are the decay of
radioactive elements, leftov...
Space.com
How has Earth's core stayed as hot as the sun's surface for billions of
years?
Jan 24, 2023 — Radioactive isotopes are not stable. They release a
steady stream of energy th...
Scientific American
Why is the earth's core so hot? And how do scientists measure ...
Oct 6, 1997 — Getty Images. EARTH. There are three main sources of heat
in the deep earth: (1...
Earth Observatory of Singapore
Why is the interior of the Earth hot
Earth Science FAQs - Geology and Tectonics. Why is the interior of the
Earth hot? The inte...
Phys.org
Probing Question: What heats the earth's core?
Mar 30, 2006 — ...
Mashable
Earth's core is wilder than you can imagine | Mashable
Jul 8, 2023 — A primary reason the core is profoundly hot is because
remnant heat from Earth'...
Heat moves out of the Earth slowly through convection and conduction. Convection is the transport of heat within the liquid outer core and
solid mantle, while conduction is the transport of heat through
nonconvecting boundary layers, like the Earth's plates at the surface.
Without the Earth's internal heat, the tectonic plates would stop
moving, and the Earth would likely cool down and become uninhabitable.
The Earth's core can reach temperatures of over 5,000°C, and the inner
core is estimated to be around 9,800°C. However, the extreme pressure
the iron in the core is exposed to, as well as other elements, may lower
the temperature by around 400°C.
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