Clarification Statement - S.2.ESS.1.1.CS:
Examples of events and timescales could include volcanic explosions and earthquakes, which happen quickly and erosion of rocks, which occurs slowly.

Assessment Boundary - S.2.ESS.1.1.AB:
Assessment does not include quantitative measurements of timescales.

Science and Engineering Practices - PK2.SEP6.1:
Make observations (firsthand or from media) to construct an evidence-based account for natural phenomena.

Disciplinary Core Ideas - S.2.ESS.1.1.DCI:
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.

Crosscutting Concepts - CC6.1:
Things may change slowly or rapidly.