Situation 2: A NASA engineer wants to see if salt will reduce the amount of ice and snow buildup on the runway. She spread 200 lbs of salt on a test runway and simulates an airplane

landing by using test equipment. She then repeats the test on a runway without applying salt.

Hypothesis

If

then

I

Situation 3: The tree house detectives want to see if different smells travel at the same speed.

They spray a can of hairspray, peppermint air freshener, and insect repellant at the same time.

Six friends stand around them in a large circle, five feet from the center of the circle where the

three tree house detectives stood.

Hypothesis:

If

then

Situation 4: The tree house detectives want to know if the candy making process affects the

odor given off by candy. To conduct the experiment, the help Dr. D make orange taffy candy.

Hypothesis: