Second grade students learn about how earth was formed and how it changes over time. This video has a great introduction to how the Earth was formed, and the history of earth and changes that have occurred over billions of years.
This video satisfies the 2-ESS1-1 requirement for second grade proficiency.
Students who demonstrate understanding can:
ESS1.C: The History of Planet Earth
Some events happen very quickly; others occur very slowly, over a time period much longer than one can observe. (2-ESS1-1)