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

Author Question: How do geologists determine the number of ice ages and when they happened? What will be an ideal ... (Read 26 times)

jake

  • Hero Member
  • *****
  • Posts: 538
on: Jul 16, 2018
How do geologists determine the number of ice ages and when they happened?
 
  What will be an ideal response?

Question 2

Because glacial ice is a natural, consolidated aggregate of minerals, it is considered to be a rock. Explain what type of rock it is: igneous, metamorphic, or sedimentary.
 
  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

jaymee143

  • Sr. Member
  • ****
  • Posts: 341
Reply #1 on: Jul 16, 2018
Answer to Question 1

The best record of the timing of past ice ages, although indirect, comes from measuring the ratio of oxygen isotopes in tiny foraminifera shells that accumulated in successive layers of deep-sea sediment. The ratio of the 18O to 16O is strongly affected by the amount of water that is evaporated from the ocean and stored on continents as glacial ice. The isotope ratios in layers of different ages can, therefore, track the occurrence of past ice ages.

Answer to Question 2

Glacial ice is a metamorphic rock because it forms from the recrystallization of snow due to increasing pressure with burial beneath the glacier surface.


jake

  • Member
  • Posts: 538
Reply 2 on: Jul 16, 2018
YES! Correct, THANKS for helping me on my review

Zebsrer

  • Member
  • Posts: 284
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.

Did you know?

Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

Did you know?

According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.

Did you know?

According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.

Did you know?

Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

Approach used to determine the evolutionary relationships among many animal species using molecular Approach used to determine the evolutionary relationships among many animal species using molecular
Conscientiousness is negatively correlated with a number of health-related behaviors. The higher the ... Conscientiousness is negatively correlated with a number of health-related behaviors. The higher the ...
The number of research articles published on the topic of religious practices and spirituality have ... The number of research articles published on the topic of religious practices and spirituality have ...
Determination of the number of theoretical stages Determination of the number of theoretical stages
How to use the discriminant to determine the value of k in a quadratic with one real root How to use the discriminant to determine the value of k in a quadratic with one real root
Correlations between scores on a psychology test and number of boiled kumquats eaten per month Correlations between scores on a psychology test and number of boiled kumquats eaten per month
Video: Primary Active Transport - electrochemical gradient and ion transport / water movement

For a complete list of videos, visit our video library