Q: Gases on earth originated from comets and what events? Choices: - supernovas - black holes - tides - volcanic eruptions A:
volcanic eruptions

Q: In what unit is heat measured in? Choices: - velocities - thermals - amperes - joules A:
joules

Q: Q: Although they differ vastly in hardness, pencil lead and diamonds both contain what element? Choices: - graphite - hydrogen - oxygen - carbon A:
A: carbon

Question: Q: What is the hardest of all minerals? Choices: - titanium - gold - platinum - diamonds A:
Answer: diamonds

*Question*
Q: An inclined plane is a good example of what kind of machine? Choices: - strong - complex - weak - simple A:
**Answer**
simple

Q: Q: If everything in a system stays the same but the pressure deceases, gas bubbles will change in what way? Choices: - they multiply - they pop - they get smaller - they get bigger A:
A: they get bigger