Author Question: What naturally occurring cleanser helps to remove pollutants from the atmosphere? Where does it come ... (Read 79 times)

Metfan725

  • Hero Member
  • *****
  • Posts: 552
What naturally occurring cleanser helps to remove pollutants from the atmosphere? Where does it come from? What other mechanisms also act to cleanse the atmosphere of pollutants?
 
  What will be an ideal response?

Question 2

How has the global human population changed from prehistoric times to 1800? From 1800 to the present? What is projected over the next 50 years?
 
  What will be an ideal response?



stillxalice

  • Sr. Member
  • ****
  • Posts: 339
Answer to Question 1

The hydroxyl radical, sea salts, and sunlight are natural cleansers of pollutants in the atmosphere. Ozone is the major source of the hydroxyl radical.

Answer to Question 2

From the dawn of human history until the beginning of the 1800s, population increased slowly and variably, with periodic setbacks. It was roughly 1830 before world population reached the 1 billion mark. By 1930, however, just 100 years later, the population had doubled to 2 billion. Barely 30 years later, in 1960, it reached 3 billion, and in only 15 more years, by 1975, it had climbed to 4 billion. Thus, the population doubled in just 45 years, from 1930 to 1975 . Then 12 years later, in 1987, it crossed the 5 billion mark In 1999, world population passed 6 billion, and it is currently growing at the rate of nearly 77 million people per year.
On the basis of current trends (which assumes a continued decline in fertility rates), the UN Population Division (UNPD) medium projection predicts that world population will pass the 7 billion mark in 2012, the 8 billion mark in 2024, and the 9 billion mark in 2047, and will reach 9.1 billion in 2050 . At that point, world population will still be increasing by 34 million per year.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Asthma cases in Americans are about 75% higher today than they were in 1980.

Did you know?

Computer programs are available that crosscheck a new drug's possible trade name with all other trade names currently available. These programs detect dangerous similarities between names and alert the manufacturer of the drug.

Did you know?

Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.

Did you know?

Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.

Did you know?

Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

For a complete list of videos, visit our video library