Which statement below best describes the movement of particles in a gas? A- the particles vibrate in a fixed position
B-the particles slide easily past one another
C- the particles move freely and are well separated
D- the particles move freely with little free space between the particles.

How does a scientist the government? a. the scientist tells people in society what to do. b. the scientist determines the policies that the government spends money on. c. the scientist provides unbiased information to the government. d. the scientist makes laws based on his or her research results.

What layer of the atmosphere is directly above the troposphere?

Which metal exist in liquid state and can be cut with knife ?