ESS102H1 Lecture Notes - Radioactive Decay, Hadean, Water Cycle

77 views2 pages
8 Feb 2013
School
Department
Course

Document Summary

Lithosphere: upper part of the solid earth. External energy: radiation from the sun, drives the water cycle and wind cycle. Internal energy: caused within the earth by radioactive decay (e. g. plate movements) Gradual: slow over millions/ billions of years. Rising human pop requires energy and resource consumption. Result: ozone hole, air/ water pollution, deforestation, etc. Universe created by a big explosion: the big bang. Hot clouds of hydrogen and helium formed giving rise to the stars and the planets. Radioactive decay caused melting of the early earth. Leading to internal differentiation: heavy elements (iron, nickel) settled in the inner core, lighter elements settled on the outside forming the mantle. Atmosphere had lots of gases especially co2 (kept the earth warm in the absence of ozone layer) and no oxygen. At 2. 4 bya, first photosynthetic bacteria evolved. Oxygen was entered into the atmosphere; ozone layer formed. Oxygen"s presence significantly decreased sulphur"s presence in the atm.

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