This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: When teaching about igneous rocks, one trick instructors often implement to help students determine ... (Read 31 times)

mspears3

  • Hero Member
  • *****
  • Posts: 586
on: Jul 16, 2018
When teaching about igneous rocks, one trick instructors often implement to help students determine the igneous composition of the samples is to use the color of the rocks as a guide.
 
  Explain how the color of an igneous rock can often be used as an indicator of its igneous composition. Be sure to reference specific minerals for each composition.
  What will be an ideal response?

Question 2

Refer to the scenario above. Assuming a temperature of 20C at the ground surface, what is the temperature at a depth of 2 miles?
 
  Scenario: In the pursuit of scientific knowledge, you decide to bore a hole into the crust to see how the temperature changes. You start your borehole in Davenport, Iowa, where the geothermal gradient is 20C/km.
  What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

vickyvicksss

  • Sr. Member
  • ****
  • Posts: 351
Reply #1 on: Jul 16, 2018
Answer to Question 1

Answer: Generally speaking, mafic rocks contain ferromagnesian minerals like pyroxene and amphibole and are therefore very dark because of the high iron and magnesium content. Felsic rocks, which contain light-colored silicate minerals such as quartz and potassium feldspar, are very light in color. Intermediate rocks, which are a combination of mafic and felsic materials, are somewhere between mafic and felsic on the color spectrum. Common intermediate minerals include plagioclase feldspar, amphibole, pyroxene, and biotite mica.

Answer to Question 2

Answer: 2 miles  1.609 = 3.2 km
3.2 km  20C/km = 64C


mspears3

  • Member
  • Posts: 586
Reply 2 on: Jul 16, 2018
Gracias!

bigsis44

  • Member
  • Posts: 317
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

If you use artificial sweeteners, such as cyclamates, your eyes may be more sensitive to light. Other factors that will make your eyes more sensitive to light include use of antibiotics, oral contraceptives, hypertension medications, diuretics, and antidiabetic medications.

Did you know?

You should not take more than 1,000 mg of vitamin E per day. Doses above this amount increase the risk of bleeding problems that can lead to a stroke.

Did you know?

To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.

Did you know?

There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

Did you know?

About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.

Oxidation of Fe-bearing minerals gives rocks, soils rusty color. Oxidation of Fe-bearing minerals gives rocks, soils rusty color.
Sample Teaching Plan for Hypertension Cont. Sample Teaching Plan for Hypertension Cont.
Chemical, Biochemical, and Organic Sedimentary Rocks Chemical, Biochemical, and Organic Sedimentary Rocks
Resources from Rocks and Minerals Resources from Rocks and Minerals
Determine exact value of tan2x,sin2x, and cos2x Determine exact value of tan2x,sin2x, and cos2x
Determine the nominal annual rate of interest of the following ordinary general annuity. Determine the nominal annual rate of interest of the following ordinary general annuity.
Video: X chromosome inactivation in calico cats

For a complete list of videos, visit our video library