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Early Earth
Early Earth

Early Earth - PowerPoint Presentation

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Early Earth - Description

earliest phase of Earth heating first seas thin atmosphere of H CO 2 H 2 O N 2 CO NH 3 CH 4 early bombardment Early Bombardment 2 phases Relative dating ID: 540855 Download Presentation

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earth early core rock early earth rock core planet heat iron trends magnetic earths melting compounds collisions temperature field

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Presentation on theme: "Early Earth"— Presentation transcript

Slide1
Slide2

Early Earth

…earliest phase of

Earth heating…

…first seas…

…thin atmosphere of

H, CO

2, H2O, N2, CO, NH3, CH4

…early bombardment…Slide3

Early Bombardment

2 phases?

Relative datingSlide4

Early Earth began to heat as the last extraterrestrial collisions subsided

Rock is a good insulator – stores heat

Collisions produced heat that was stored

Radioactivity

Gravitational contraction

Earth Developed

a Magma Sea4.5-4.0 billion years agoWhat is the physical consequence of melting a ball of rock with many different types of elements and compounds?Slide5

Temperature reached melting point

of iron

:

Liquid iron flowed inward

Friction raised temperature

Less dense compounds flowed

outward (SiO2 and others)

“Iron Catastrophe”

Planet became chemically

differentiatedSlide6

Fe/Ni

Fe/Mg

Increasing

Fe toward

core

Increasing

Si toward

surface

There are certain trends in Earths chemistry.

The crust is relatively depleted in Fe, Mg and enriched in Si, OSlide7

Effect of

chemical

differentiation

There are certain trends in Earths chemistry.

The crust is relatively depleted in Fe, Mg and enriched in Si, OSlide8

Earth’s magnetic field

emanates from the

core complex and

surrounds the planet.

Magnetism gained

from early nebula is

magnified by turbulentiron, nickel fluid of outer core.Magnetic field envelops

entire

planet

Polarity

+

-

tends to reverse and fluctuate with timeSlide9
Slide10

Earth is probably not built of

uniform layers, it is likely mixed somewhat by convectionSlide11

MANTLE PLUMES

warm rock rises, cool rock descends

How will the lithosphere respond to a plume?Slide12

The continental rifting process

a

q

KkSlide13