3 Most missed Questions from the Rock Test 2010

Mr. Sturken’s classes

September, 2010

11.When temperature and pressure change, what can happen to the minerals

in a rock?• Key- The question is asking about the

forces that create metamorphic rockWhen rocks are exposed to heat and

pressure, they can become metamorphic rocks

The minerals in a metamorphic rock are different than the minerals in the rock they formed from so….

They change into other minerals

Metamorphic Rock• When rock changes into

metamorphic rock, its appearance, texture, crystal structure and mineral content change

• Metamorphic rock can form out of igneous, sedimentary, or other metamorphic rock.

21. What kind of texture will a conglomerate rock have?

• Coarse-grained

(large grains)

Types of Clastic Sedimentary Rock

• Conglomerate and Breccia can have a mixture of rock fragments of different sizes but we always consider them to be coarse-grained

• Conglomerate has round fragments• Breccia has large sharp-edged

fragments

22. What determines the composition of a rock?

• Composition refers to “what something is made of”.

• What are rocks made of?Rocks are made of minerals and organic materials

So… the composition of a rock is determined by the minerals it is made of

Chapter 9 Fossils- Law of Uniformitarianism

• So, a brief definition of Uniformitarianism would be: the natural laws that govern geologic processes have not changed over geologic time, but the rate at which certain geologic processes operate can vary.  Uniformitarianism also has been paraphrased as "The Present is the Key to the Past".

From http://www.indiana.edu/~geol105b/1425chap6.htm

THIS IS NOT FROM THE ROCK TEST, IT IS A NEW TOPIC