*Question*: A recent study concluded that about 90% of all large predatory fish such as tuna have disappeared from the world's oceans in the past 50 years. Which of these is most likely the direct cause of this loss? OPTIONS:
- Urban development near the coast
- Commercial harvesting from the ocean
- Climate change on Earth
- Acid precipitation over the oceans
*Answer*: Commercial harvesting from the ocean

*Question*: Most underground caves are formed by the action of water on OPTIONS:
- granite
- limestone
- sandstone
- shale
*Answer*: limestone

*Question*: When bedrock in Massachusetts is examined, it often appears scraped and polished. Which of the following most likely caused the bedrock to appear scraped and polished? OPTIONS:
- crustal deformation
- frequent earthquakes
- glacial movement
- volcanic eruptions
*Answer*:
glacial movement