Answer the questions by clicking on the "?" sign to choose your answer.

1. Which of the items below contains plasma?

   1.   ?    a magnet
   2.   ?    a fluorescent light bulb
   3.   ?    a digital clock

2. Which of the items below is an example of plasma?

   1.   ?    blood
   2.   ?    a match
   3.   ?    a star

3. Which of the items below is an example of plasma?

   1.   ?    a flame
   2.   ?    the sun
   3.   ?    both "a" and "b"
   4.   ?    neither "a" nor "b"

4. What is the key to moving from one phase to the next phase?

   1.   ?    energy
   2.   ?    temperature
   3.   ?    pressure
   4.   ?    compounds

5. True or false? Substances can exist in all four phases at the same time on earth.

   1.   ?    True
   2.   ?    False