E 82, December 11, 2017

Standard:  Obtain, evaluate, and communicate information to understand how rock relationships and fossils are used to reconstruct the Earth’s past.
Learning Target:
Interpret a geologic cross-section and describe how unconformities form, as well as construct an argument applying principles of relative age.
Open:  Check 21.1 & 21.2 section assessments
Go over 21.1 & 21.2 section assessments, begin notes on 21.3 & 21.4
half life demonstration