*Question*
Q: What can occur during periods of heavy rain? Choices: - volcanoes - glaciers - earthquakes - floods A:
**Answer**
floods

*Question*
Q: What may be lost when waves travel through matter, but not when they travel through space? Choices: - matter - frequency - threshold - energy A:
**Answer**
energy

*Question*
Q: What characteristic of reptile eggs allows them to be laid on land instead of in water? Choices: - they are dry - they trap gas - they are circular - they are amniotic A:
**Answer**
they are amniotic

*Question*
Q: Which is the lightest of the widely used structural metals? Choices: - Metal - calcium - potassium - magnesium A:
**Answer**
magnesium