Q: What force provides resistance whenever two surfaces are in contact? Choices: - vibration - tension - rotation - friction A:
friction

Q: What is to blame for water's boiling point (100c) being higher than the boiling points of similar substances? Choices: - electrode bonds - molecular shape - helium bonds - hydrogen bonds A:
hydrogen bonds

Q: Q: What is the term for the sudden movement of large blocks of rock and soil down a slope? Choices: - sludge - torrent - hurricane - slump A:
A: slump

Question: Q: What happens to a substance in a liquid state when the temperate is lowed? Choices: - it melts - it evaporates - it dissipates - it solidifies A:
Answer: it solidifies

*Question*
Q: What is the term for disease-causing agents, such as bacteria and viruses? Choices: - spores - parasites - vaccines - pathogens A:
**Answer**
pathogens

(Question)
Q: What is the primary cause of air movement in the troposphere? Choices: - solar winds - asteroids - the ozone layer - differences in heating A:
(Answer)
differences in heating