This topic contains a solution. Click here to go to the answer

Author Question: When teaching about igneous rocks, one trick instructors often implement to help students determine ... (Read 25 times)

mspears3

  • Hero Member
  • *****
  • Posts: 586
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
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!


okolip

  • Member
  • Posts: 362
Reply 3 on: Yesterday
:D TYSM

 

Did you know?

As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.

Did you know?

Pink eye is a term that refers to conjunctivitis, which is inflammation of the thin, clear membrane (conjunctiva) over the white part of the eye (sclera). It may be triggered by a virus, bacteria, or foreign body in the eye. Antibiotic eye drops alleviate bacterial conjunctivitis, and antihistamine allergy pills or eye drops help control allergic conjunctivitis symptoms.

Did you know?

People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.

Did you know?

Tobacco depletes the body of vitamins A, C, and E, which can result in any of the following: dry hair, dry skin, dry eyes, poor growth, night blindness, abscesses, insomnia, fatigue, reproductive system problems, sinusitis, pneumonia, frequent respiratory problems, skin disorders, weight loss, rickets, osteomalacia, nervousness, muscle spasms, leg cramps, extremity numbness, bone malformations, decayed teeth, difficulty in walking, irritability, restlessness, profuse sweating, increased uric acid (gout), joint damage, damaged red blood cells, destruction of nerves, infertility, miscarriage, and many types of cancer.

Did you know?

According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.

For a complete list of videos, visit our video library