. A(n) ____________________ is a chemical layer that protects the surface of a material. (Fill in the blank)

. A(n) ____________________ is a chemical layer that protects the surface of a material.
 
  Fill in the blank(s) with the appropriate word(s).

Question 2

New York has the largest urban metropolitan population in the world.
 
  Indicate whether the statement is true or false

Question 3

Hunger is a serious problem in many parts of Africa and Asia.
 
  Indicate whether the statement is true or false

Question 4

The world population more than doubled between 1960 and 2007.
 
  Indicate whether the statement is true or false

Question 5

Brushes used with oil-based stains or varnish should be cleaned in
 
 

a. water c. denatured alcohol
  b. turpentine or mineral spirits d. soap suds

Question 6

The rate of growth of the human population today is slowing.
 
  Indicate whether the statement is true or false

Question 7

The population of the world is about 3.5 billion people.
 
  Indicate whether the statement is true or false

Question 8

A plastic filler that can be purchased in colors is called
 
 

a. shellac c. plastic wood
  b. glazing compound d. paste wax