« previous next »

Author Question: How can the oxygen-isotope ratio in the calcium carbonate shell remains of organisms found in ocean ... (Read 209 times)

neverstopbelieb

  • Hero Member
  • *****
  • Posts: 534
on: Jul 13, 2018
How can the oxygen-isotope ratio in the calcium carbonate shell remains of organisms found in ocean sediment provide information about past sequences of glacier advances and retreats?

Question 2

The thermosphere is where charged particles from the sun interact with air molecules to produce ____.
 A) ozone
  B) auroras
  C) radio waves
  D) humidity


Smiles0805

  • Sr. Member
  • ****
  • Posts: 305
Reply #1 on: Jul 13, 2018
Answer to Question 1

Because certain organisms that once lived near the surface of water can only live within a narrow range of temperatures, the distribution and type of organisms within the sediment indicate the temperature of the surface water. Most of the oxygen in seawater is composed of 8 protons and 8 neutrons in its nucleus, giving it an atomic weight of 16. However, about one out of every thousand oxygen atoms contains an extra 2 neutrons, giving it an atomic weight of 18. When ocean water evaporates, the oxygen-18 tends to be left behind. Consequently, during periods of glacier advance, the oceans, which contain less water, have a higher concentration of oxygen-18. The shells of marine organisms are constructed from the oxygen atoms exiting in ocean water, so determining the ratio of oxygen-18 to oxygen-16 within these shells yield information about how the climate may have varied in the past. A higher ratio of oxygen-18 to oxygen-16 in the sediment suggests a colder climate, whereas a lower ratio suggests a warmer climate.

Answer to Question 2

B


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

neverstopbelieb

  • Hero Member
  • *****
  • Posts: 534
Reply #2 on: Jul 13, 2018
Thank you


Smiles0805

  • Sr. Member
  • ****
  • Posts: 305
Reply #3 on: Jul 13, 2018
No problemo


« previous next »
 

Did you know?

Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

Did you know?

This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

Did you know?

For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

Did you know?

Stevens-Johnson syndrome and Toxic Epidermal Necrolysis syndrome are life-threatening reactions that can result in death. Complications include permanent blindness, dry-eye syndrome, lung damage, photophobia, asthma, chronic obstructive pulmonary disease, permanent loss of nail beds, scarring of mucous membranes, arthritis, and chronic fatigue syndrome. Many patients' pores scar shut, causing them to retain heat.

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.

The open ocean is the most extensive biome on earth. The open ocean is the most extensive biome on earth.
Punnett square illustrating the genotypes underlying a 9 : 3 : 3 : 1 ratio Punnett square illustrating the genotypes underlying a 9 : 3 : 3 : 1 ratio
Biological anthropologists map skeletal remains from a prehistoric site. Biological anthropologists map skeletal remains from a prehistoric site.
FDA-Approved Indications for Calcium Channel Blockers FDA-Approved Indications for Calcium Channel Blockers
Causes of Ocean Currents Causes of Ocean Currents
CCS, BECS, biochar, cloud albedo, and ocean fertilization CCS, BECS, biochar, cloud albedo, and ocean fertilization
Video: How antibiotics works? 💊

For a complete list of videos, visit our video library