« previous next »

Author Question: When atmospheric CO2 concentrations reach ________, scientists believe a possible climatic threshold ... (Read 63 times)

jlmhmf

  • Hero Member
  • *****
  • Posts: 552
on: Jul 14, 2018
When atmospheric CO2 concentrations reach ________, scientists believe a possible climatic threshold in which Earth systems could transition in a chaotic mode will be reached.
 
  A) 300 ppm B) 350 ppm C) 400 ppm D) 450 ppm E) 500 ppm

Question 2

Which of the following is the correct sequence from the surface to the bedrock in a typical soil horizon.
 
  A) O, A, E, B, C B) C, B, E, A, O C) S, O, I, L D) O, E, C, B, A E) A, B, C, O, R


softEldritch

  • Sr. Member
  • ****
  • Posts: 334
Reply #1 on: Jul 14, 2018
Answer to Question 1

D

Answer to Question 2

A


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

ACTH levels are normally highest in the early morning (between 6 and 8 A.M.) and lowest in the evening (between 6 and 11 P.M.). Therefore, a doctor who suspects abnormal levels looks for low ACTH in the morning and high ACTH in the evening.

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.

Did you know?

In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.

Did you know?

Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.

Did you know?

The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.

Measures of ocean chlorophyll-a concentrations from part of Atlantic Canada in (a) January 2006, and Measures of ocean chlorophyll-a concentrations from part of Atlantic Canada in (a) January 2006, and
The ozone hole in September, 2003. Even as scientists verified that the rate of ozone depletion was The ozone hole in September, 2003. Even as scientists verified that the rate of ozone depletion was
Atmospheric Optical Phenomena Atmospheric Optical Phenomena
(a) A photograph of a radial immunodiffusion reaction for measurement of patient IgA concentrations. ... (a) A photograph of a radial immunodiffusion reaction for measurement of patient IgA concentrations. ...
Carbon Dioxide Concentrations for 400,000 years Carbon Dioxide Concentrations for 400,000 years
Threshold traits Threshold traits
Video: Prone Position

For a complete list of videos, visit our video library