From which layer of the atmosphere do particles of air escape into space? A.)exosphere

B.)troposphere

C.)mesosphere

D.)stratosphere

If a swimmer is traveling at a constant speed of 0.85 m/s,how long would it take to swim the length of a 50m olympic sized pool?

How many countries were represented at the paris negotiations (where the treaty of versailles was signed) in january 1919?

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.