Which of the following is considered a physical environmental hazard?
a. fire
b. lead in water
c. smoking cigarettes
d. being attacked in a dark alley

Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?

Agraduated cylinder contains 63.0 ml of water. a piece of gold, which has a density of 19.3 g/ cm3, is added to the water and the volume goes up to 64.5 ml. calculate the mass in grams of the gold that was added to the water. explain how you got your answer.

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.