New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here

Earth 120, Week 7 Note

by: alicekhanh

Earth 120, Week 7 Note ERTH 120

Marketplace > Santa Ana College > Earth Science > ERTH 120 > Earth 120 Week 7 Note
Santa Ana College

Preview These Notes for FREE

Get a free preview of these Notes, just enter your email below.

Unlock Preview
Unlock Preview

Preview these materials now for free

Why put in your email? Get access to more of this material and other relevant free materials for your school

View Preview

About this Document

Theory of plate tectonics
Phys Earth/Space Systems
Joanna Fantozzi
Class Notes
Earth Science
25 ?




Popular in Phys Earth/Space Systems

Popular in Earth Science

This 2 page Class Notes was uploaded by alicekhanh on Wednesday March 30, 2016. The Class Notes belongs to ERTH 120 at Santa Ana College taught by Joanna Fantozzi in Spring 2016. Since its upload, it has received 42 views. For similar materials see Phys Earth/Space Systems in Earth Science at Santa Ana College.

Similar to ERTH 120 at Santa Ana College

Popular in Earth Science


Reviews for Earth 120, Week 7 Note


Report this Material


What is Karma?


Karma is the currency of StudySoup.

You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 03/30/16
Chapter 7: Plate Tectonics 1. Earth’s Interior - Earth’s interior consists of three main layers based on composition  Crust - rich in silicon and oxygen (aka silicates)  Continental crust - thicker, less dense  Oceanic crust - thinner, more dense  Mantle - contains more iron and magnesium  More dense than both types of crust  Core - mostly iron and nickel  Outer - liquid iron o Generates magnetic field, which sometimes flip-flops  Inner - solid iron and nickel o High pressures keep it in the solid form - Earth’s interior consists of two main layers based on properties  Lithosphere  Behaves rigidly  Crust and upper mantle  Asthenosphere  Flows as a soft solid  Upper mantle 2. Evidence for Plate Tectonics - Alfred Wegener compiled evidence for continental drift based on:  Fit of the continents  Identical fossils found on land separated by the sea  Similar geologic features found on land separated by the sea  Evidence of past glaciers found on land now far from the poles - But the hypothesis of continental drift was not accepted since it could not explain how or why continents moved - Harry Hess later proposed the theory of sea-floor spreading  A chain of underwater volcanoes exists in the middle of the ocean (known as mid-ocean ridges)  As continents drift apart, new ocean floor forms in between as lava cools at the mid-ocean ridges and pushes the plates apart  Evidence is seen in the magnetic stripes in the sea floor  As new ocean floor forms, the iron-rich minerals inside align with the magnetic field  But sometimes, the Earth’s magnetic poles flip-flop 3. Theory of Plate Tectonics - Movement is now explained by the theory of plate tectonics  Earth’s outer shell is broken into rigid plates that move  Plate boundaries are identified by earthquakes and volcanoes  Plates interact along their boundaries


Buy Material

Are you sure you want to buy this material for

25 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

Why people love StudySoup

Steve Martinelli UC Los Angeles

"There's no way I would have passed my Organic Chemistry class this semester without the notes and study guides I got from StudySoup."

Janice Dongeun University of Washington

"I used the money I made selling my notes & study guides to pay for spring break in Olympia, Washington...which was Sweet!"

Jim McGreen Ohio University

"Knowing I can count on the Elite Notetaker in my class allows me to focus on what the professor is saying instead of just scribbling notes the whole time and falling behind."


"Their 'Elite Notetakers' are making over $1,200/month in sales by creating high quality content that helps their classmates in a time of need."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.