Earth Science Name_________________________

Rock Test: 71 points

Section I: Multiple choice. Choose the best answer for the following._____1. Shale refers to a rock formed from:

A. Sand sized materialB. Plant remainsC. Clay mineralsD. Calcium Carbonate

_____2. A clastic rock is:A. a rock formed from the cementation of transported grainsB. a rock formed from evaporation of sea waterC. transformed by heat into limestoneD. transformed by pressure into limestone

_____3. Most shells of marine organisms are composed of ________ .A. silicaB. calcium carbonateC. calcium phosphateD. calcium sulfate

_____4. Which of the following lists is written in order of decreasing particle size?A. sandstone, siltstone, conglomerateB. sandstone, conglomerate, siltstoneC. conglomerate, sandstone, siltstoneD. siltstone, sandstone, conglomerate

_____5. Which of the following rocks is deposited only by non-biological, chemical precipitation ?

A. haliteB. limestoneC. chertD. coal

_____6. In the following list which term refers to silica content typical of peridotite (mantle rock)?

A. UltramaficB. MaficC. IntermediateD. Felsic

_____7. In the following list which term refers to igneous rocks with silica content typical of granite and rhyolite?

A. UltramaficB. MaficC. IntermediateD. Felsic

_____8 . In the following list which term refers to the silica content typical of a basalt or gabbro?A. UltramaficB. MaficC. IntermediateD. Felsic

_____9. In the following list which term refers to the silica content typical of an andesite or diorite?

A. UltramaficB. MaficC. IntermediateD. Felsic

_____10. When a basaltic liquid first starts to crystallize the first mineral in the Discontinuous Reaction Series to form is

A. Ca-rich plagioclaseB. Na-rich plagioclaseC. K-feldsparD. QuartzE. Olivine

_____11. Which of the following metamorphic rocks is NOT foliated? A. gneiss B. schistC. slate D. marbleE. phyllite

_____12. Contact metamorphism is best developed A. next to lava flows. B. next to large bodies of intrusive igneous rocks. C. next to small bodies of extrusive igneous rocks. D. deep in the ocean

_____13. Gneiss is a metamorphic rock associated with:A. high temperature, high pressure conditionsB. high temperature, low pressure conditionsC. low temperature, low pressure conditionsD. low temperature, high pressure conditions

_____14. Foliation is:A. layering observed in sedimentary rocksB. alignment of any kind observed in any kind of rocksC. an alignment of mineral grains in a metamorphic rockD. layering of igneous rocks

_____15. Which of the following lists is arranged in order from highest to lowest grade of metamorphic rock?

A. gneiss, slate, schist, phylliteB. gneiss, schist, phyllite, slateC. slate, gneiss, phyllite, schistD. slate, phyllite, schist, gneiss

Section II: Short Answer

16. What is the difference between a poorly sorted sandstone and well sorted sandstone when it comes to how the sediment was deposited? (4 points)

17. You and a friend are out hiking along a trial. Your friend finds a breccia and tries to tell you that it was formed in a beach environment. How would you refute your friend’s position? (Hint: I am looking for information about the texture of the rock. Think about what a breccia represents and think about what you would expect to find at a beach) (4 points)

18. Define transgression (regression). How do we recognize from sedimentary rocks when transgression (regression) has occurred? Draw a diagram to illustrate( 5 points)

18. What is contact metamorphism and how can it be distinguished from regional metamorphism? (3 points)

19. In your own words, what is the difference between marble and gneiss? (I want more then just color). You need to explain texture, metamorphic grade, and metamorphic setting. (4 points)

20. Directions: Use the Bowen’s Reaction Series graph to answer the following questions below.

You stop along the side of the highway to look at a 1,000 m. high outcrop. You decide to climb to the outcrop and look at the rocks. The base of the outcrop has a layer of olivine and calcium plagioclase. 100 meters up the cliff the rock is pyroxene and a sodium-bearing calcium plagioclase .At 350 meters, the rock contains amphibole and a calcium-bearing sodium plagioclase. At 650meters, the minerals are biotite and sodium plagioclase. From 900 meters to the top the rock is granite. Explain how this out crop could have been formed. Explain at each height what is going on here?

Include a diagram with description (10 points)

Section III: Igneous Rock Identification

Directions: Use the images below to fill out the table on the next page. (8 points)

Sample 1

Sample 2

Sample 3

Sample 4

Identification Table

Sample Number Texture Composition Rock Name

Section IV: Metamorphic Rock Identification ( 12 points)

Sample 1:

Sample 2:

Sample 3: Contains calcium carbonate and reacts with acid.

Sample 4:

Texture (Foliated or Nonfoliated)

Rock Name Parent Name

Section V: Sedimentary Rock Identification: I need the name of the rock and the diagnostic characteristic (texture, grain size etc. ) (6 points)

Sample 1:

Name___________________________________

Diagnostic Characteristic______________________________

Sample 2:

Name___________________________________

Diagnostic Characteristic______________________________

Sample 3: Does not react with acid

Name___________________________________

Diagnostic Characteristic______________________________