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

Author Question: A volcanologist extracts a piece of rock near a volcano site and observes no visible crystals. After ... (Read 55 times)

danielfitts88

  • Hero Member
  • *****
  • Posts: 535
on: Jul 16, 2018
A volcanologist extracts a piece of rock near a volcano site and observes no visible crystals. After studying the rock for a while, he assumes it is obsidian. Why does he do so?
 
  A) Obsidian is always hot.
  B) Obsidian forms underground.
  C) Obsidian is green.
  D) Obsidian forms in lava flows.

Question 2

Why should a student on a field trip in Yosemite National Park assume that a piece of rock, that when under a microscope shows tiny crystals, is basalt?
 
  A) Basalt forms in lava flows.
  B) Basalt forms underground.
  C) Basalt is green.
  D) Basalt is always hot.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

FergA

  • Sr. Member
  • ****
  • Posts: 352
Reply #1 on: Jul 16, 2018
Answer to Question 1

Answer: D

Answer to Question 2

Answer: A


danielfitts88

  • Member
  • Posts: 535
Reply 2 on: Jul 16, 2018
Wow, this really help

Alyson.hiatt@yahoo.com

  • Member
  • Posts: 354
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

Did you know?

It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

Did you know?

In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.

Did you know?

No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.

Did you know?

Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

Close-up of a cat's claw, with the quick clearly visible Close-up of a cat's claw, with the quick clearly visible
The Dome of the Rock, Jerusalem. The Dome of the Rock, Jerusalem.
Metastatic process: Tumor leaving primary site to travel to other distant organs to grow. Metastatic process: Tumor leaving primary site to travel to other distant organs to grow.
A piece of glass has a thin film of gasoline floating on it. A beam of light is shining ... A piece of glass has a thin film of gasoline floating on it. A beam of light is shining ...
Ciliated protozoan Tetrahymena with buccal cavity visible. Ciliated protozoan Tetrahymena with buccal cavity visible.
A land snail (Helix aspersa) with the opening that leads to its lung visible at the left. A land snail (Helix aspersa) with the opening that leads to its lung visible at the left.
Video: Mutations and translation

For a complete list of videos, visit our video library