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

Author Question: Explain how radioactive dating works, and why it works only with igneous rocks. What will be an ... (Read 86 times)

krzymel

  • Hero Member
  • *****
  • Posts: 548
Explain how radioactive dating works, and why it works only with igneous rocks.
 
  What will be an ideal response?

Question 2

Why are supermassive galaxies often found at the cores of rich galaxy clusters?
 
  A) Most of the matter forming the cluster fell into the center to form one large galaxy.
  B) They are the result of many galactic mergers; one galaxy growing at the expense of others.
  C) Such a large galaxy attracted smaller galaxies around it to form a cluster.
  D) Large galaxies, passing a cluster, get captured into the center.
  E) Many globular clusters swarmed together to form it.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

gasdhashg

  • Sr. Member
  • ****
  • Posts: 335
Answer to Question 1

Radioactive dating compares the amount of a radio isotope left in a rock with its decay product; the older the rock, the less original radioactive material remains, and the more decay product has built up. Since this rate of decay is steady and predictable, that will let us get the age of an igneous rock. The igneous rocks have not been changed since they crystallized; metamorphic ones have often been heated enough to recrystalize minerals and reset the atomic clock, while sedimentary rocks are mixtures of many specimens of differing ages.

Answer to Question 2

B



krzymel

  • Hero Member
  • *****
  • Posts: 548
Both answers were spot on, thank you once again




 

Did you know?

Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.

Did you know?

As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.

Did you know?

The use of salicylates dates back 2,500 years to Hippocrates's recommendation of willow bark (from which a salicylate is derived) as an aid to the pains of childbirth. However, overdosage of salicylates can harm body fluids, electrolytes, the CNS, the GI tract, the ears, the lungs, the blood, the liver, and the kidneys and cause coma or death.

Did you know?

The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

Did you know?

The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.

For a complete list of videos, visit our video library