« previous next »

Author Question: A uranium-lead age determined from a zircon crystal removed from a sandstone would reflect the time ... (Read 26 times)

altibaby

  • Hero Member
  • *****
  • Posts: 562
on: Jul 16, 2018
A uranium-lead age determined from a zircon crystal removed from a sandstone would reflect the time elapsed since the ________ of the zircon.
 
  A) erosion
  B) deposition
  C) crystallization
  D) cementation

Question 2

In order to use a radioactive-decay scheme to calculate the age of a mineral all of the following conditions must be met except
 
  A) the half-life must be known.
  B) no daughter isotope present prior to the start of parental decay or the amount of daughter can be determined.
  C) no parent or daughter isotopes can be gained or lost from the mineral once decay starts.
  D) only one radioactive isotope can exist in the rock so that cross-decay doesn't occur.


JaynaD87

  • Sr. Member
  • ****
  • Posts: 368
Reply #1 on: Jul 16, 2018
Answer to Question 1

Answer: C

Answer to Question 2

Answer: D


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

All patients with hyperparathyroidism will develop osteoporosis. The parathyroid glands maintain blood calcium within the normal range. All patients with this disease will continue to lose calcium from their bones every day, and there is no way to prevent the development of osteoporosis as a result.

Did you know?

Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

Did you know?

For high blood pressure (hypertension), a new class of drug, called a vasopeptidase blocker (inhibitor), has been developed. It decreases blood pressure by simultaneously dilating the peripheral arteries and increasing the body's loss of salt.

Did you know?

Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.

Did you know?

Though “Krazy Glue” or “Super Glue” has the ability to seal small wounds, it is not recommended for this purpose since it contains many substances that should not enter the body through the skin, and may be harmful.

Cirrhosis. Cirrhosis is characterized by a chronic deterioration of the liver, replacing healthy cel Cirrhosis. Cirrhosis is characterized by a chronic deterioration of the liver, replacing healthy cel
Time Line of Human History From Upper Paleolithic Period to the Present Time Line of Human History From Upper Paleolithic Period to the Present
In Situ Uranium Leaching In Situ Uranium Leaching
Gossip and ridicule increase the status insecurity of this time of life. Gossip and ridicule increase the status insecurity of this time of life.
Time Estimates for Specific Office Procedures Time Estimates for Specific Office Procedures
Anatomy of the Large Intestine By the time chyme reaches the large intestine, most of its nutrients Anatomy of the Large Intestine By the time chyme reaches the large intestine, most of its nutrients
Video: Status Epilepticus

For a complete list of videos, visit our video library