A) One medium is air, in which light has a speed of 3.00 × 108 m/s. The other medium is ice, in which light has a speed of 2.29 × 108 m/s. Use this information to identify medium A and medium B. Explain b) Do you know in which direction the light beam is travelling? Does it matter? Explain.

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.