What causes air masses to move? A.) A difference in air pressure and temperature occurs.
B.) Weather conditions change rapidly to produce storms.
C.) A collision takes place between two natural wind patterns.
D.) Long, narrow bands of wind blow in the upper atmosphere.

Correct Answer is D.

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Margaret wants to make an orange flavored drink by stirring powdered drink mix into a glass of water. she doesn't like drinks that have small clumps of powdered solid in them, so she wants the drink to be a perfect solution. what factors should margaret not consider when deciding how much powder to add to her glass of water?

Chemistry worksheet - i am not sure what they are asking for exactly?