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Lecture 5

GSC 102 Lecture Notes - Lecture 5: Inner Core, Chemosynthesis, Hydrogen Sulfide


Department
Geological Sciences
Course Code
GSC 102
Professor
ta-shanataylor
Lecture
5

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GSC102 Lecture 5:
Archean= “Beginning/origin”
4.0 to 2.5 billion years ago
Life appears
Atmosphere, land, oceans (H20), volcanoes, ash
Much more geologic data for the Archean compared to the Hadean
Precambrian rock slide:
Shields= what’s beneath all the rock that’s built up over the past billion years
“Basement rocks” very old
Earth layers slide:
Outer core is liquid
Inner core is mostly ironwe cannot image it because of the liquid outer core. It
blocks waves
Both cores are dominated by iron
S waves moves through only solid
P waves moves through solids, liquids, gases
Earth is the only planet in the solar system with a magnetosphere so large for the
size of the planet
Iron generates magnetism very easily
Electricity= moving electrons from atom to atom (copper is a good conductor)
Magnetism= as the electron is orbiting the nucleus, it spins. When electron spins
within the atom, generates an electric fieldit is not passed from atom to atom.
Iron is good at letting electrons spin within its orbitdue to liquid outer core
Without Earth’s magnetosphere, there would be no life on Earth
o It blocks UV rays that would destroy DNA, oceans,
o Mars has a weak magnetosphere compared to the earth. There was
water on Mars at one point (ocean and atmosphere) but solar winds
hit the planet and the magnetosphere
o To have a colony on Mars, we would have to generate a
magnetosphere on the planet or develop some sort of bio-dome to
protect the planet from UV rays
Second atmosphere slide:
Archean is the second atmosphere
o We just don’t know what the Hadean atmosphere was like
o Most likely very different from Hadean atmosphere, but we actually
have rocks as data for Archean Eon
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