{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture+15+Earth+History

Lecture+15+Earth+History - Lecture 15 Earth History Figure...

Info iconThis preview shows pages 1–23. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 15 Earth History
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Figure 12.7
Background image of page 2
Origin of the atmosphere Origin of the atmosphere and oceans and oceans Water vapor condensed to form clouds and rainwater that formed the oceans About 3.5 billion years ago, photosynthesizing bacteria began to release oxygen Oxygen levels steadily increased over time Eventually oxygen levels were sufficient for ozone to develop in the atmosphere
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Origin of the atmosphere Origin of the atmosphere and oceans and oceans Outgassing produced acidic conditions that caused an accelerated rate of weathering of Earth’s rocky surface Products of this weathering were carried to the oceans, thus increasing the salinity of the oceans Oceans also served as a depository for carbon dioxide
Background image of page 4
Figure 12.6
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 6
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 8
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 10
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Stromatolites Photosynthesis CO 2 + H 2 O CH 2 O + O 2 Carbon Dioxide Controls Calcite Dissolution and Precipitation CaCO 3 + CO 2 + H 2 O Ca2+ + 2HCO 3 -
Background image of page 12
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 14
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Figure 12.8
Background image of page 16
Precambrian history Precambrian history The Precambrian, which is divided into the Archean and the Proterozoic eons, spans almost 90% of Earth’s history Much of Earth’s stable continental crust was created during this time Partial melting of the mantle formed volcanic island arcs and ocean plateaus These crustal fragments collided and accreted to form larger crustal provinces
Background image of page 17

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Precambrian history Precambrian history The Precambrian, which is divided into the Archean and the Proterozoic eons, spans almost 90% of Earth’s history Much of Earth’s stable continental crust was created during this time Larger crustal areas were assembled into larger blocks called cratons Cratons form the core of modern continents
Background image of page 18
Formation of Formation of continental crust continental crust Figure 12.12
Background image of page 19

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Figure 12.13
Background image of page 20
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}