GLY 160 – Lecture Note Outline for Tuesday, February 13, 2007

• Exam 1 will be given on Thursday (Feb. 15).  A review sheet is available here.

• The exam will include multiple choice, true-false, and maybe some matching, as well as 5 or so short-answer written questions.  Have questions ready Tuesday, see me or a TA during office hours, or e-mail me if you have any questions or need some help.

• Click on one of these links to access Rock Cycle diagrams used in lecture.

  • Click here to view a color rock cycle diagram

  • Click here to view a box model diagram of the rock cycle

• Lab this week - Rocks and a quick mineral identification quiz.

The Rock Cycle

The Rock Cycle - "the progressive transformation of Earth materials from one rock type to another."

- each type of rock forms from a pre-existing rock (rocks are constantly changing!):

-- sedimentary rocks form near Earth's surface

-- metamorphic rocks form at great depths (high T & P)

-- magma occurs at still greater depths (higher T)

-- continuous burial of sediment will typically produce first sedimentary, then metamorphic, then igneous rocks

THE ROCK CYCLE - Crayola-style??

• Start out with a few crayons (representing rocks!), make a pile of shavings

  • In terms of the rock cycle, what have you just created? _________________

• Use your hands to squeeze and press on the crayon filings together - what kind of rock have you created? _______________

• What next?

• What kind of rock is formed?

• What next?

What does WTDL stand for?

What does HPF stand for?

What does MC stand for?

Paths through the Rock Cycle

Example 1 - just one example of a path through the rock cycle - not the only path.

1) Igneous rock at the earth's surface breaks down to form _______________

• How? What processes?

2) Sediment is transported and deposited, then ______________ into sedimentary rock

• How? What processes?

3) Sedimentary rock may become buried and converted into _________________ rock.

• How? What processes?

4) Metamorphic rock could melt ("partially melt") to form magma

• How? What processes?

5) Magma could later solidify into (____________ or _______________) igneous rock

So, the path would be igneous -> sedimentary -> metamorphic -> igneous

Example 2 - Another example of a path through the rock cycle

Start with step #3 above

4) Metamorphic rock could be uplifted, weathered, and eroded to form ____________________

• How? What processes?

5) Sediment is transported and deposited, then lithified into sedimentary rock

So, the path would be igneous -> sedimentary -> metamorphic -> sedimentary (No Melting occurs!)

Other examples:

Assignment for Thursday - prepare for Exam 1. The exam will begin promptly at 9:30 AM and will end at 10:20 AM.