*Question*: Rocks that contain fragments of bones, shells, and plant remains are most likely OPTIONS:
- crystals.
- igneous.
- sedimentary.
- metamorphic.
*Answer*: sedimentary.

*Question*: Which action forms a different chemical substance? OPTIONS:
- crushing a rock
- burning a piece of wood
- mixing salt and pepper
- melting an ice cube
*Answer*: burning a piece of wood

*Question*: Data indicate that chemical pollutants contaminate 53% of the waterways that empty into the Chesapeake Bay. These chemical pollutants are found in the tissues of animals living in the bay. Which group of people who live away from the bay might be most affected by these chemical pollutants? OPTIONS:
- people who walk near the bay
- people who read books about the bay
- people who consume fish from the bay
- people who own boats docked in the bay
*Answer*:
people who consume fish from the bay