« previous next »

Author Question: According to the Soil Conservation Service, it takes about ____ to form topsoil from the subsoil ... (Read 37 times)

jparksx

  • Hero Member
  • *****
  • Posts: 570
on: Jul 21, 2018
According to the Soil Conservation Service, it takes about ____ to form topsoil from the subsoil parent material.
 
  a. 15 years c. 25 years
  b. 20 years d. 30 years

Question 2

Chlorinated hydrocarbons such as chlordane, toxaphene, and DDT could last ____ or more in the soil.
 
  a. 5 years c. 80 years
  b. 20 years d. 100 years


connor417

  • Sr. Member
  • ****
  • Posts: 329
Reply #1 on: Jul 21, 2018
Answer to Question 1

D

Answer to Question 2

B


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

Did you know?

People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.

Did you know?

Approximately 500,000 babies are born each year in the United States to teenage mothers.

Did you know?

Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.

Did you know?

Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.

Female cheetah and cubs in the Ngorongoro Conservation Area Female cheetah and cubs in the Ngorongoro Conservation Area
Stages of endometrial cancer. Stage I: Mutated cells arise from glandular epithelium of the endometr Stages of endometrial cancer. Stage I: Mutated cells arise from glandular epithelium of the endometr
Hot Springs Form on the Seafloor Near Spreading Centers Hot Springs Form on the Seafloor Near Spreading Centers
Instructions for Completing the CMS-1500 (02/12) Claim Form Instructions for Completing the CMS-1500 (02/12) Claim Form
A depiction of the amount of precipitin that would form with different ratios of antigen and ... A depiction of the amount of precipitin that would form with different ratios of antigen and ...
Soil salinization Soil salinization
Video: Hyperglycemia Animation

For a complete list of videos, visit our video library