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 66 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
:D TYSM

parker125

  • Member
  • Posts: 332
Reply 3 on: Yesterday
Gracias!

« previous next »
 

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.

Did you know?

Automated pill dispensing systems have alarms to alert patients when the correct dosing time has arrived. Most systems work with many varieties of medications, so patients who are taking a variety of drugs can still be in control of their dose regimen.

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.

Did you know?

Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.

Did you know?

Alcohol acts as a diuretic. Eight ounces of water is needed to metabolize just 1 ounce of alcohol.

Carrie Mae Weems, You Became a Scientific Profile, from the series From Here I Saw What Happened ... Carrie Mae Weems, You Became a Scientific Profile, from the series From Here I Saw What Happened ...
This pediatric growth chart tracks the height and weight for girls ages 2–20. This pediatric growth chart tracks the height and weight for girls ages 2–20.
Amniocentesis. The patient is examined with ultrasound to determine the placental site and to locate ... Amniocentesis. The patient is examined with ultrasound to determine the placental site and to locate ...
How to determine if a function is even or odd How to determine if a function is even or odd
Under ideal conditions, a single cell of the bacterium E. coli would divide every 20 minutes to ... Under ideal conditions, a single cell of the bacterium E. coli would divide every 20 minutes to ...
Chromosome Number in Selected Animal Species Chromosome Number in Selected Animal Species
Video: Dorsal Recumbent Position

For a complete list of videos, visit our video library