Q: Colored alcohol is used in some glass thermometers. When placed in air of different temperatures, the column of alcohol rises or falls in the glass thermometer. Which of the following best explains why the height of the alcohol column changes? ----

A: The alcohol expands more than the glass when heated.

Q: Lori owns a house next to the lake. She uses lots of fertilizer to keep her lawn green. Which impact could fertilizing her lawn have on the lake? ----

A: an increase in the algae population

Q: Why do doctors suggest that people get a flu vaccine each year? ----

A: Viruses can mutate from year to year.

Q: Which energy resource is renewable? ----
A: wind