*Question*
Q: Moving electrons have a form of kinetic energy called what? Choices: - potential energy - electromagnetism - deformed energy - electrical energy A:
**Answer**
electrical energy

*Question*
Q: What element is released into the atmosphere by the burning of fossil fuels? Choices: - carbon - helium - oxygen - sulfur A:
**Answer**
sulfur

*Question*
Q: Land could not be colonized by other organisms until what became established? Choices: - gases - carbon dioxide - oxygen - plants A:
**Answer**
plants

*Question*
Q: Where does most of the earth's energy come from? Choices: - magnetic field - its core - its atmosphere - sun A:
**Answer**
sun