Lesson 5: Radiometric Dating and Earth’s Age
Duration of Days: 4
Lesson Objective
Students will be able to analyze radiometric dating data, evaluate the reliability of dating methods, and apply half-life calculations to determine the age of rocks, fossils, and geologic events.
-How do scientists use radioactive isotopes to determine the age of Earth materials?
-What assumptions and limitations exist within radiometric dating methods?
-How can half-life calculations be used to determine absolute age?
-Why are multiple dating methods often used to verify geologic ages?
-How has radiometric dating contributed to our understanding of Earth's history and geologic time?
-Radiometric dating
-Isotope
-Radioactive decay
-Half-life
-Parent isotope
-Daughter isotope
-Absolute age
-Relative age
-Decay constant
-Geochronology
-Index fossil
HS-ESS1-4 – Use rock strata and fossil evidence to explain Earth’s history.
NGSS Crosscutting Concepts
-Patterns
-Cause and Effect
-Scale, Proportion, and Quantity
-Stability and Change
-Students will analyze complex decay graphs and isotope data tables.
-Students will solve multi-step half-life and age determination problems.
-Students will evaluate scientific claims using quantitative evidence.
-Students will interpret graphical and numerical data similar to SAT evidence-based questions.
Students will investigate how radiometric dating provides evidence for Earth's age and geologic history. Through quantitative analysis, interpretation of authentic scientific data, and evaluation of dating methods, students will apply principles of radioactive decay to determine ages and assess the validity of scientific conclusions.
Activities may include:
-Advanced half-life and decay-rate calculations
-Analysis of real radiometric dating datasets
-Evaluation of multiple isotope dating methods
-Comparing strengths and limitations of relative and absolute dating techniques
-Scientific argumentation using geologic evidence
Purpose: Develop advanced quantitative reasoning and evidence-based explanations regarding Earth's age and geologic history.
DOK Level: 4 – Extended Thinking
-Archaeological and anthropological dating of ancient civilizations
-Geochronology and Earth science research careers
-Determining the timing of major events in Earth’s history
-Use of radiometric dating in environmental and planetary science investigations
-Radiometric dating provides an exact age without uncertainty
-All materials can be dated using the same isotope system
-Radioactive decay rates vary significantly under normal Earth conditions
-Relative dating and absolute dating produce identical information
-Extension problems involving multiple isotope systems
-Scientific journal article analysis
-Data interpretation and evidence-based discussion protocols
-Collaborative investigation of authentic datasets
-Optional enrichment using advanced mathematical calculations
-Complex half-life and radiometric dating calculations
-Analysis of authentic isotope data
-Scientific explanation supported by quantitative evidence
-Argumentative writing evaluating dating methods
-Data interpretation and graph analysis tasks
-Half-life simulations
-Radiometric dating datasets
-Decay curve and isotope ratio graphs
-Scientific articles on geochronology
-Calculator and data analysis tools