GEOL 106 - LEC 8

2 Pages
130 Views
Unlock Document

Department
Geological Sciences and Geological Engineering
Course
GEOL 106
Professor
Prof.
Semester
Fall

Description
What causes the stress in the earth? • That’s what we need to answer now. So lets look at the dynamic earth system more closely Structure of the earth • Seismic waves have been critical in giving us a “picture”of the inside of the earth ( an “xray” of the Earth ). The waves are reflected and refracted at boundaries between different materials. • Waves reveal a layered earth • P and S wave .. P waves can go through liquid .. s waves cant.. determines 3 layers. Mantle, Outer core and Inner core. We live on crust. 2900 km from crust to get to outer core ( depth of mantle) .. 5100 km from crust to get to core… 6371 km to get to centre of earth. Mantle (solid) outer core (liquid) inner (solid) . • Continental crust in about 30 km thick and oceanic crust in 5 km thick. • Moho is the boundary between the crust and mantle. • Moho stands for Mohorivicic Discontinuity .. What about the composition of the layers. • The core of the earth . outer/inner is mostly out of iron (Fe). And the mantle is made out of minerals called silicates (O, Si, Mg, Fe,Al,etc ) .. Iron, oxygen, silicon , aluminum , magnesium (Silicates :minerals that have O and Si as their basic building blocks) • Chemical Composition of Mantle .. order of decreasing abundance (by weight) … O. Si
More Less

Related notes for GEOL 106

Log In


OR

Join OneClass

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

Sign up

Join to view


OR

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.


Submit