What did pennsylvania massachusetts and rode island colonies have in common

Which of the following best summarizes the idea represented by this graph?

What are the four classes of fire according to nfpa?

Which statement is correct? the speed of the light ray is the same in air and medium a. the speed of the light ray is the same in air and medium b. medium a and medium b have different densities because light refracts at different angles. medium a and medium b have the same density because the light ray strikes both at the same angle.