ERTH 2404 Lecture Notes - Lecture 3: Pycnocline, Halocline, Thermocline

106 views4 pages

Document Summary

Little atmosphere early on because most of the original gas envelope disappeared because of high heat radiating the planet. Water began accumulating in liquid about 4bya to form oceans. Water of oceans has mass of 1. 4x 10^24. Mantle lost 0. 031% of mass as h2o to produce oceans. Alternate source of earth"s ocean water is comet-like balls of ice. Ph is a log scale measure of activity of hydrogen ion. Area covered by oceans may be decreasing because continents are growing (less room for oceans) Autotrophs (2. 3bya) = oxidized inorganic compounds through chemosynthesis. Single celled plants (2. 1bya) coincided with appearance of significant amount of oxygen. 1. 8bya = oxygen levels reached 10% present levels. Density ranges from 1. 02200 to 1. 03000g/cm3 in the open ocean. Density determines the positions and motions of water masses in the ocean. The in situ density sigma in deep trenches is about 5% greater than at the ocean surface.

Get access

Grade+20% off
$8 USD/m$10 USD/m
Billed $96 USD annually
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
40 Verified Answers
Class+
$8 USD/m
Billed $96 USD annually
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
30 Verified Answers

Related Documents