Analyses of rock strata and the fossil record provide only relative dates, not an absolute scale. The geologic time scale interpreted from rock strata provides a way to organize Earth’s history.Construct a scientific explanation based on valid and reliable evidence obtained from sources (including the students’ own experiments) and the assumption that theories and laws that describe the natural world operate today as they did in the past and will continue to do so in the future.The performance expectation above was developed using the following elements from the NRC document A Framework for K-12 Science Education:Ĭonstructing Explanations and Designing SolutionsĬonstructing explanations and designing solutions in 6–8 builds on K–5 experiences and progresses to include constructing explanations and designing solutions supported by multiple sources of evidence consistent with scientific ideas, principles, and theories. Students who demonstrate understanding can:Ĭonstruct a scientific explanation based on evidence from rock strata for how the geologic time scale is used to organize Earth's 4.6-billion-year-old history.
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