Dating Earth’s and Solar System History gives Grade 10 Science students a structured way to examine how scientists reconstruct geologic time using multiple lines of evidence. The lesson connects relative-age methods, absolute-age methods, and planetary evidence to build a coherent history of Earth and other solar system bodies.

Build a Timeline from Multiple Lines of Evidence

Students examine how stratigraphic sequences and cross-cutting relationships establish relative ages, then explore how radioactive decay, half-life, and parent-to-daughter isotope ratios provide absolute ages. The resource also introduces crater counting as evidence for reconstructing timelines on planetary and lunar surfaces.

The reading passage explains how deeper and shallower rock layers can be ordered, why a feature that cuts another feature is younger, and how radiometric measurements can estimate when rocks formed. Students also consider why older airless surfaces tend to preserve more impact craters and how lunar bombardment evidence can be connected with Earth's rock record.

What Students Do

• Work through a dialogue and matching activity to connect key ideas.
• Complete a cloze passage using vocabulary related to relative dating, radiometric dating, isotopes, decay, and crater evidence.
• Label a diagram and interpret a focused reading passage about geologic clocks.
• Answer multiple-choice questions that apply stratigraphic sequencing, cross-cutting relationships, half-life, isotopic ratios, crater counting, and integrated timelines.
• Evaluate true and false statements about relative and absolute age evidence.
• Respond to short-answer prompts explaining cross-cutting relationships, the role of half-life, and crater preservation on the Moon.
• Write an extended response comparing what each dating method reveals and explaining why combining methods strengthens a geologic timeline.

What the Teacher Receives

• Printable science worksheet activities focused on Earth’s place in the universe and geologic time reconstruction.
• A separate Teacher Guide PDF with Learning Objectives, Teaching Tips, Discussion Questions, and Common Mistakes.

Classroom Use

Use this resource for Grade 10 Earth and space science instruction, guided practice, independent work, review, or assessment. The sequence moves from ordering events by relative age to calculating absolute ages conceptually and then applying planetary crater evidence, giving students opportunities to connect individual dating methods into a broader model of solar system history.