- Chapter 18 summary (18.6)
- Begin Chapter 21 summary
- Anchoring Phenomenon: How do everyday activities impact Earth?
- Complete prompt on page 119
- Investigative Phenomenon: How do limestone caves form?
- Video: Limestone caves
- CER: What is the chemical reaction involved in the formation of Limestone caves? Make a claim.
- Ocean Acidification explained (video)
- Sand dollar video
- Brainstorm questions