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

Author Question: Many economically important metallic elements like gold and silver are disseminated throughout ... (Read 21 times)

mspears3

  • Hero Member
  • *****
  • Posts: 586
on: Jul 16, 2018
Many economically important metallic elements like gold and silver are disseminated throughout magma. Why are we able to mine these metals?
 
  A) They are easy to pick out of lava flows with tools that reach a few meters away.
  B) They don't melt; they float in lava flows and are then trapped when the lava melts; humans go in and mine the lava flows.
  C) They become concentrated by fractional crystallization into the last bit of the magma that remains after most of the silicate minerals have formed.
  D) They float up to the surface of the lava and harden on top of the flow.

Question 2

According to Figure 4.22 which types of magma can erupt as lava flows?
 
  A) Basaltic, Andesitic, and Dacitic
  B) Basaltic, Andesitic, Dacitic and Rhyolitic
  C) Basaltic and Andesitic
  D) Basaltic


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

connor417

  • Sr. Member
  • ****
  • Posts: 329
Reply #1 on: Jul 16, 2018
Answer to Question 1

Answer: C

Answer to Question 2

Answer: B


mspears3

  • Member
  • Posts: 586
Reply 2 on: Jul 16, 2018
Wow, this really help

epscape

  • Member
  • Posts: 335
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.

Did you know?

Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.

Did you know?

In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

Did you know?

According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.

Did you know?

About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.

1–12 Elements essential to animal life and health 1–12 Elements essential to animal life and health
Some biologically important hydrogen bonds Some biologically important hydrogen bonds
The recent mass upheavals in Tunisia, Egypt, Libya, Yemen, and Syria gave political scientists a cha The recent mass upheavals in Tunisia, Egypt, Libya, Yemen, and Syria gave political scientists a cha
Creede, Colorado, circa 1890, a rough silver mining town that grew from 660 people in 1889 to over 1 Creede, Colorado, circa 1890, a rough silver mining town that grew from 660 people in 1889 to over 1
The hazmat training pyramid. It is important to train from the ground up, starting with a firm grasp ... The hazmat training pyramid. It is important to train from the ground up, starting with a firm grasp ...
Re-creation of Pheidias’s Huge Gold and Ivory Figure of Athena Re-creation of Pheidias’s Huge Gold and Ivory Figure of Athena
Video: Glucose anabolism reactions: Glycogenolysis and Gluconeogenesis

For a complete list of videos, visit our video library