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Earth Tectonics & Science
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What is the ø of the earth?
8,000 miles
What is the ø of the sun?
800,000 miles
What is the earth circumference?
24,000 miles
Describe Earth's 3 distinct, concentric layers:
Iron Core
Mantle
Crust
Describe 2 types of the Earth's Crust:
Oceanic → Mafic → Basalt
Continental → Felsic → Granitic
Describe 3 sources of Earth's residual Heat:
Gravitational energy
Kinetic energy → planetesimal collisions
Meteor impacts
Heat from within the Earth is continually generated by:
Radioactive decay
What is a
Lithosphere
and where is located?
Rigid
outer
layer containing "crust" & frozen part of the upper mantle
What is the
Asthenosphere
and where is located?
Partially melted upper mantle
has
plastic-like
What is the
Lower Mantle
and where is located?
Mesosphere
Solid layer of rocks
between the asthenosphere iron core
What are the components of Earth's core and where are they located?
Liquid Core
Solid Iron Core
What happened to most of the hydrogen and helium that accumulated with Earth's mass?
Escaped
Earth did not have enough gravity
How much free oxygen was available very early in Earth's history?
Almost none
What does the presence of pyrite grains in early sedimentary rocks imply?
Back then was no free oxygen because pyrite was not oxidized like in today's atmosphere.
Describe the occurrence of "
B
anded
I
ron
F
ormations" during early Earth times?
(2.5 - 2 billion yrs)
BIF require abundant oxygen
Therefore, during that time there must have been more free oxygen
Became thick + cover vast areas
Which ancient life forms were present at least 3.5 billion years ago that began creating Earth's fee oxygen?
Bacteria + Algae
Author
Anonymous
ID
242515
Card Set
Earth Tectonics & Science
Description
Unit 4
Updated
2013-10-24T02:44:49Z
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