*Question*
Q: What is a mixture of potassium nitrate, sulfur, and charcoal? Choices: - gasoline - cyanide - TNT - gunpowder A:
**Answer**
gunpowder

*Question*
Q: What is the term for the process in which an area that has never before been colonized changes through time? Choices: - continuous succession - environmental succession - colony succession - ecological succession A:
**Answer**
ecological succession

*Question*
Q: Density is defined as the mass of an object divided by its what? Choices: - size - liquid - growth - volume A:
**Answer**
volume

*Question*
Q: Visible light is the narrow segment of what, to which the normal human eye responds? Choices: - molecular spectrum - radio spectrum - phenomena spectrum - electromagnetic spectrum A:
**Answer**
electromagnetic spectrum