Relative Dating of Rock Strata helps Grade 7 science students use evidence from rock layers, fossils, unconformities, faults, and other geologic features to reconstruct the relative sequence of events in Earth history. Designed for the NGSS-aligned lesson topic Earth's Place in the Universe, this worksheet moves students from core principles to applying relative dating evidence.

What Students Practice

Students apply superposition to determine the relative ages of undisturbed sedimentary layers and use original horizontality to explain changes such as tilting or folding after deposition. They interpret cross-cutting relationships to determine when faults and magma bodies formed compared with the rocks they affect.

The resource also develops students' ability to use fossils and unconformities as evidence for comparing rock layers and identifying missing time. Students construct and explain relative sequences involving depositional, tectonic, and erosional events rather than assigning exact numerical ages.

Question and Activity Types

The worksheet combines a focused reading passage with multiple-choice questions, true/false statements, short-answer explanations, a labeled diagram, a categorization activity, and a short note. These tasks give students opportunities to recall geologic principles, interpret evidence, sequence events, and explain their reasoning in their own words.

What You Receive

• ✔️ Student worksheet focused on relative dating of rock strata and Earth history
• ✔️ Separate PDF answer key
• ✔️ Student Notes lines for recording important ideas
• ✔️ Teacher Guide with Learning Objectives, Teaching Tips, Discussion Questions, and Common Mistakes

Classroom Use

Use this resource for direct instruction follow-up, independent practice, science review, or a lesson activity on relative dating and geologic history. The included Teacher Guide supports preparation and discussion, while the separate answer key makes checking student work straightforward.

Students finish by connecting individual observations to a larger geologic sequence, reinforcing how scientists use relationships among rock layers, fossils, unconformities, faults, and intrusions to reconstruct Earth's past.