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

Planet Earth Week 3 (including lab notes!)

by: Abi Sommers

Planet Earth Week 3 (including lab notes!) Geol 105

Abi Sommers

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

Here are the notes from Wednesday and Friday's lectures , including lab notes! ( Monday there was no class)
Planet Earth
John Platt
Class Notes
planet, EARTH, rocks, Mineral, plate, tectonics, lab, notes
25 ?




Popular in Planet Earth

Popular in Department

This 7 page Class Notes was uploaded by Abi Sommers on Friday September 9, 2016. The Class Notes belongs to Geol 105 at 1 MDSS-SGSLM-Langley AFB Advanced Education in General Dentistry 12 Months taught by John Platt in Fall 2016. Since its upload, it has received 21 views.


Reviews for Planet Earth Week 3 (including lab notes!)


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: 09/09/16
Week 3 Notes :  9   7 Answers to last week’s pop quiz: 1. What term best describes the part of Earth that forms the tectonic plates?  Lithosphere 2. The radius of the Earth’s core is about one sixth radius of the earth.  False  3. Which is not correct? ­ Earth’s mantle is made of liquid rock 4. Plate material is formed at divergent boundaries and destroyed at convergent  boundaries.  True  5. Boundaries of plates most clearly indicated by :  distribution of earthquakes  6. The sun is the principal energy source that drives plate tectonics. False  7. Which statement is not correct : plate boundary in central california is a subduction  zone  8. The East African Ridge and Mid­ Atlantic Ridge are both expressions of divergent plate  boundaries. True  Earth Materials II : Rocks  Rocks   :   Rock Description: ­ Mineral assemblage ­ Grain­ size ( size of crystals) ­ Texture ­ Organization and structure   ● These all give info that allow us to interpret how the rock formed  Texture:  Crystalline texture ­   grains may have crystal faces and interpenetrate       ­   may result from growth of grains       ­      granite Sedimentary (Clastic)  texture ­ Rounded or angular grains ­ Do not interpenetrate ­ Separated by matrix ­  Pebbly sandstone and conglomerate ­ sediment deposited by rivers ­ Clastic  means segmented        Granite:                     ­   The main constituent of the continental crust       ­   An igneous rock , a crystallized rock      ­   made of mainly quartz and feldspar      ­   rich in Si , Al, Na, K       ­   Oxygen is most abundant element !   Peridotite:  ­ Main constituent of Earth’s mantle ­ Crystalline texture ­ Peridotite made up of mainly olivine ( also pyroxene, sometimes garnet) ­ Mainly Si (less than in the crust) and Mg ­ Oxygen is most abundant element!  Classification of rocks by texture and origin I . Igneous rocks ­ Crystalline texture ­ Crystallize from a melt (magma)             2. Sedimentary rocks  ­ Clastic texture (mainly) ­ Grains deposited by flowing water or wind 3. Metamorphic rocks ­ Crystalline texture ­ Growth of minerals in the solid state ­ Form by modification of other types of rock  Igneous rocks:   ­ Igneous rocks form by solidification from a liquid  ( magma, molten rock). Magma may  crystallize within the crust ( intrusive igneous rocks), or flow out at the surface as lava ( extrusive (volcanic) igneous rocks  ­ Intrusive igneous rocks  ­  Basalt dike, New Zealand ­ Magma may be emplaced into the crust , forming igneous  intrusions ­ The magma cools more slowly (years to millions of years) ­ Crystals have time to grow ­ Rocks are medium or coarse grained, with a crystalline texture        ­    Plutonic rocks                   ­       Granite, Sierra Nevada             ­   large crystals are k­feldspar                        ­    large intrustion of igneuous rocks called plutons  ­  cool very slowly, coarse­grained ● Interpretation based on observation of the great size of the rocks  Sedimentary Rocks  : ­ Grains transported by rivers, currents, tides, waves or wind are deposited to form clastic  sedimentary rocks.        ( Bedded conglomerates, Fish Canyon, California)  Metamorphic Rocks :  ­ Start as one thing and end up as another ­ Garnet amphibolite with garnet, hornblende, and feldspar ­ Metamorphic rocks have a crystalline structure Mineralization:  ­ Water flows through pore spaces and fractures in rock ­  Dissolves material  ­ Precipitates it as cement, and in fractures ( veins ) ­ minerals deposit by fluids include  ­ quartz  ­  calcite  ­ many economically valuable minerals ( gold, silver, ore materials )  9/9 Lecture   (Monday’s quiz will not include this info) Exam Question of the Day :  The theory of isostasy states that : D. Topography (surface elevation) is controlled by  the density and thickness of the crust Extrusive igneous rocks :  ­ Magma extruded at surface solidifies to form fine grained or glassy volcanic rock; lava  flows  ­ Glass is a non­crystalline solid ­ Volcanic lava can cool to form a glass ­ Some volcanic rock has “fine grained” or microscopic crystals    ­  Columnar jointing in basalt lava ­ columnar joining in basalt County Antrim, Northern Ireland ­ every point within lava flow pulls away for others points and breaks up into    columns  ( mud cracks and column jointing in lava produced by same physical process) ● If  magma is ejected violently, may be deposited as ash ( pyroclastic rocks) Intrusive igneous rocks :   3 types ­ ( important definitions! )                   ­  Dike ­  a tabular intrusion that is discordant with surrounding rock           ­   Pluton ­a large intrusion ( usually discordant, but so big, hard to see)         ­   Sill ­ a tabular intrusion that is concordant with the surrounding rocks   Where and why does melting occur within the Earth? Where ­ 1. At mid­ocean ridges 2. In mantle plumes 3. Above subduction zones 4. In zones of mountain building Magmatism at mid­ocean ridges: ­ Melting is a result of decompression of mantle rock rising beneath ridge ­ Occurs at 30­60 km depth ­ Melting of mantle peridotite ­ Magma cools to form 6km thick ocean crust ­ Forms distinctive sequence of intrusive and extrusive rocks ­ Locally preserved on land : ophiolite        Lava cooled fast, fine grained called : basalt       Coarse grained Intrusion called : gabbro  Melting at mid­ocean ridges ­ Melting of mantle peridotite beneath MOR ­ Produces basalt magma : ­ Low content of SiO2 ­ High content of Fe and Mg       ­ melting is attributed to decompression, as the asthenosphere rises towards the surface          ( see lecture diagram)  ­ Convection is the manner heat is conducted ;Hot material rises, cool material sinks,  transaction occurring by transferring of heat   Quiz Monday!   Lab Week 3 ● The Earth’s mantle is higher because of isostasy  3 kinds of plate boundaries 1. Divergent  ←- --> 2. Convergent  ­­> <­­ 3. Transform   ­­­­­­­> ←------ Divergent boundaries ; plates move apart; new seafloor is made ­ Hot material within mantel reaches top and cools down at sea floor  ­ Forms new material and rocks at sea floor , new material pushes old apart, to left and  right, creates mid atlantic ridge Convergent boundaries ; one plate is subducted (the denser plate) ­ the Andes Mountains are an example of this 3 types of Convergent boundaries;   ­  Ocean­Continent collision   (andes mountains and peru­chile trench)  ­  Continent­continent collision ( himalayas and tibetan plateau)  ­  Ocean ­ ocean collision ( japanese islands and japan trench) Transform boundaries ; plates slide past each other along strike slip faults  ­ San andreas fault is an example of this ­  The Pacific plate has been grinding horizontally past north american plate for 10 million  years Hot spots ­  ­  Not related to plate tectonics ­  Chain of volcanoes formed above a stationary magma chamber in mantle ­ Can be used to determine plate motion rates and directions  ­ Hot spots are beneath active volcanoes


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

Bentley McCaw University of Florida

"I was shooting for a perfect 4.0 GPA this semester. Having StudySoup as a study aid was critical to helping me achieve my goal...and I nailed it!"

Jennifer McGill UCSF Med School

"Selling my MCAT study guides and notes has been a great source of side revenue while I'm in school. Some months I'm making over $500! Plus, it makes me happy knowing that I'm helping future med students with their MCAT."

Bentley McCaw University of Florida

"I was shooting for a perfect 4.0 GPA this semester. Having StudySoup as a study aid was critical to helping me achieve my goal...and I nailed it!"


"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.