Q: Competition with what emerging animal group may have led to extinction of cynodonts about 200 million years ago? Choices: - reptiles - amphibians - insects - mammals A:
mammals

Q: Astronomers have wondered if the universe is expanding fast enough to escape the pull of what? Choices: - kinetic energy - Coreolis effect - light - gravity A:
gravity

Q: Q: Are thunderstorms more likely where the ground temperatures are extremely high or extremely low? Choices: - somewhat low - somewhat high - extremely low - extremely high A:
A: extremely high

Question: Q: What law explains how the change in direction of the light ray depends on how the speed of light changes, which in turn is related to the indices of refraction of the media involved? Choices: - Boyle's law - Born's law - Newton's first law - law of refraction A:
Answer: law of refraction

*Question*
Q: What is the only natural phenomenon that causes more damage than earthquakes? Choices: - volcanos - blizzards - landslides - hurricanes A:
**Answer**
hurricanes

*Question*
Q: What is the addition of oxygen to a molecule or the removal of hydrogen from a molecule called? Choices: - precipitation - evaporation - ionization - oxidation A:
**Answer**
oxidation