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Chemical Signatures of Asteroid Impacts

Topic
  • Evolution
  • Extinction
  • Earth Science
  • Earth History
  • Geology
  • Science Practices
  • Data Analysis
Resource Type
  • Activities
  • Lessons
Level
High School — General
Favorited By
3 Users
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Description

This activity allows students to analyze the chemical data that led researchers to conclude that a layer of clay at the boundary between the Cretaceous and Paleogene rock layers (the K-Pg boundary) contained an extraordinary concentration of iridium. It supports concepts presented in the short film The Day the Mesozoic Died.

After watching the film, students will calculate the chemical signatures of two K-Pg (formerly referred to as K-T) boundary samples and compare them to those of a chondrite, a rock that originated from space, and a typical basalt, a rock that originated from Earth’s mantle. Students then evaluate elemental ratios to determine how well the evidence supports the conclusion that the iridium signal in K-Pg sediments was produced by an extraterrestrial impact.

Student Learning Targets
  • Calculate and use ratios to identify the source of a sample based on its chemical composition.

  • Evaluate the hypotheses, data, analyses, and conclusions in a scientific or technical text, verifying the data when possible and corroborating or challenging conclusions with other sources of information.

Details
Estimated Time
One to two 50-minute class periods.
Key Terms

basalt, C1 chondrite, Cretaceous Period, differentiated, iridium, “parts per” notation, platinum-group elements, Tertiary Period, ratio

Terms of Use

The resource is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International license. No rights are granted to use HHMI’s or BioInteractive’s names or logos independent from this Resource or in any derivative works.

Version History
Date Published 03.05.12
Curriculum Connections
NGSS (2013)

HS-ESS1-6, HS-PS1-5; SEP4, SEP6

AP Environmental Science (2013)

I.A

IB Environmental Systems and Societies (2017)

1.3

Common Core (2010)

ELA.RST.9–12.4, ELA.RST.9–12.7, ELA.WHST.9-12.9
Math.N-Q.1, Math.A-REI.2, Math.A-REI.3; MP1, MP2

Materials
Student Handout (PDF) 256 KB
Teacher Materials (PDF) 190 KB
Additional Materials

a scientific calculator

Use This Resource With
Video Resource
The Day the Mesozoic Died

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