Curated OER
What is a Karst
Students investigate landforms by holding a class experiment. In this topography lesson, students define the word "karst" and discover why sinkholes are created on the surface of the Earth by completing worksheets. Students create a...
Curated OER
Where Have All the Glaciers Gone?
Fourth graders discover that scientists examine evidence from around the world in order to explain global climate change. They see that records of climate change exist, and describe photographs interpreting changes in glaciers over time.