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Plate tectonics
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When did the Earth form?
4.6 billion years ago
When did the early atmosphere form?
4-3.8 billion years ago
Early Earth:
Earth cooling – continents forming condensing water forms oceans
volcanic outgassing
Water vapor
Ammonia (NH3)
Methane (CH4)
Hydrogen sulfide (H2S)
Hydrogen gas (H2)
Carbon dioxide (CO2)
formation of Earth’s magnetic field
Photosynthesis:
CO
2
+ H
2
O + sun ---> C
6
H
12
O
6
+ O
2
2.3 billion years ago
blue algae could make its own food
aerobic resperation
O
2
+ CHO --> CO
2
+ H
2
O
(single-celled bacteria)
development of the ozone
1 billion years ago
filters harmful UV radiation
crucial for the ability to colonize on land
Cambrian
530 million years ago:
multi-celled organisms
life is widespread in the oceans
Devonian
450 Million years ago
terrestrial organisms all over
modern atmosphere
Theory of plate tectonics:
lithosphere broken into a
number of rigid plates (at least 13 major) “floating” in the asthenosphere
plates move slowly (~2 cm/year)
movement causes plates to collide ® Plate boundary
Seafloor spreading
age of oceanic crust increases outward from ridges
Cambrian (picture)
Author
kamrunsreno
ID
12321
Card Set
Plate tectonics
Description
NRES 211 midterm
Updated
2010-03-29T05:30:29Z
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