Class Notes (806,449)
Canada (492,253)
ERS120H5 (146)
Lecture 3

lecture 3.docx

2 Pages
Unlock Document

University of Toronto Mississauga
Earth Science
Lindsay Schoenbohm

Lecture 3 Plate tectonics: on the move Plate tectonics = foundation of geology Earth’s Crust • Continental crust (low density)  35 km thick  2.6 grams more dense than water (1) • Oceanic crust (high density)  10 km thick  3.2 grams more dense than water (1) Earth’s Interior • Lithosphere (crust and uppermost mantle)  rigid, frozen solid as cold • Asthenosphere (upper mantle)  ductile (easily deformed), warm enough – so plate can slide around it easily o It is still solid and does not act as a liquid o Kind of like a layer of grease which plates move around on Tectonic plate is not just the earth’s crust but also includes interior Plate tectonic model • Lithosephere = thin, cool, and hard • Asthenosphere = weak and hot • Lithosphere broken into large fragments called plates • Plates “float” on asthenosphere • Plates move around and interact w/ each other Isostasy • Plates “float” @ an elevation depending on thickness and density o Required pressure to be equal • Himalayas are high due to deep root Plate boundaries can be • Divergent : moving away from each other • Convergent: moving towards each other • Transform: moving past each other Alfred Wagner: meteorologist  fit of continents, matching rock units, matching mountain belts, matching fossils across various continents proving the continents must have been conjoined at one point, matching paleoclimate belts (climates), matching glaciations (ice sheets) – ice glacier that extended past the ocean and into other continents – proving that the continents were conjoined Lecture 3 Plate tectonics: on the move • Pan
More Less

Related notes for ERS120H5

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.