Evidence for a Changing Earth is a Grade 7 Science worksheet that challenges students to reconstruct Earth's history using fossils, rock layers, and evidence of plate movement. Students investigate how scientists determine the relative ages of undisturbed sedimentary layers, why geological disturbances complicate those interpretations, and how independent lines of evidence combine to support explanations about Earth's past.

🪨 Read the Evidence Preserved in Rocks

The reading passage introduces fossils as preserved remains or traces of organisms from the past and explains how their locations and characteristics help scientists investigate earlier organisms and environments. Students examine the principle of superposition, which states that lower sedimentary layers are generally older than the layers above them when the sequence remains undisturbed.

The lesson also examines what happens when geological processes alter the original arrangement of rock layers. Tilting, folding, and faulting can change the sequence scientists observe, so students must consider the condition of the rocks before determining their relative ages. They also explore how matching fossils and similar rock types on continents now separated by oceans can support the idea that those continents were once connected.

🔎 Build Explanations from Multiple Lines of Evidence

Students apply the reading through multiple-choice questions, true-or-false statements, concise written responses, a matching activity, a cloze passage, an extended-response question, and a Did You Know feature. These tasks reinforce key vocabulary while asking students to distinguish reliable interpretations from assumptions.

A central focus is evidence-based geological reasoning. Learners consider why scientists should not automatically treat the lowest visible rock layer as the oldest when rocks have been disturbed. They also explain why combining fossil evidence, rock-layer relationships, and plate-movement evidence produces a stronger account of Earth's history than relying on a single observation.

This Earth science worksheet is useful for teaching relative dating, fossil evidence, geological history, and the interpretation of rock sequences. It gives students opportunities to explain scientific relationships in their own words and connect separate observations into a reasoned conclusion.

📦 Resources Included

• ✔️ Student worksheet with a reading passage and follow-up activities
• ✔️ Separate PDF answer key for checking responses
• ✔️ Student Notes & Lesson Summary supplement for reviewing essential concepts and vocabulary
• ✔️ Separate PDF Teacher Guide containing learning objectives, teaching tips, discussion questions, and common mistakes

🧑‍🏫 Classroom Applications

Use this Grade 7 geology resource during a lesson on Earth's changing surface, as guided reading followed by independent work, or as a review of fossils and relative rock-layer dating. The extended response provides an opportunity to assess how well students connect several types of geological evidence, while the notes supplement offers a separate reference for lesson review. The teacher guide supports preparation and follow-up discussion, and the separate answer key makes response checking more convenient.

Designed for the Texas Science 7 topic area of Solar System, Tectonics and Water, this TEKS-focused resource helps students examine how scientists test explanations about Earth's past. It connects geological vocabulary with the reasoning needed to interpret disturbed rock layers, compare evidence, and explain how Earth's history can be reconstructed from preserved clues.