Earth's Interior and Heat Transfer is a Grade 9 Science worksheet focused on how scientists use multiple lines of evidence to model Earth's layered structure and explain energy transfer inside the planet. Students work with seismic waves, gravity data, heat-flow measurements, density changes, temperature gradients, and mantle convection.

Build an Evidence-Based Earth Model

The resource connects observable evidence to scientific inferences about Earth's interior. Students examine how P-waves and S-waves behave in different materials, why changes in wave speed can indicate boundaries between layers, and how gravity patterns provide evidence for differences in density. Heat-flow measurements are used to connect Earth's warmer interior with outward energy transfer and long-term thermal evolution.

What Students Do

• Respond to a dialogue question about Earth's interior evidence.
• Match related concepts and evidence.
• Complete a cloze paragraph using key Earth science vocabulary and relationships.
• Label a diagram representing the interior model.
• Read a passage connecting seismic waves, gravity, heat flow, and mantle convection.
• Answer multiple-choice questions that require interpretation of seismic behavior, density contrasts, heat flow, temperature gradients, and convection.
• Evaluate true-or-false statements about P-waves, S-waves, temperature with depth, and convection.
• Write brief responses explaining seismic-wave observations, temperature gradients, and heat-flow evidence.
• Construct an extended explanation using seismic, gravity, and heat-flow evidence to connect Earth's layers with mantle convection.

Teacher Support Included

A separate Teacher Guide PDF provides learning objectives, teaching tips, discussion questions, and common mistakes. These supports help teachers introduce the evidence, prompt scientific reasoning, and address misconceptions while students develop their Earth interior model.

Classroom Use

Use this Earth science practice as guided classwork, independent practice, a lesson review, or a written assessment of students' ability to connect evidence with models and processes. The combination of selected-response, diagram labeling, reading, and written explanation gives students opportunities to demonstrate both factual knowledge and evidence-based reasoning.

Students finish by bringing the evidence together: seismic-wave behavior helps reveal internal boundaries and material states, gravity supports inferences about density and layered composition, and heat-flow measurements help explain temperature gradients and convection. This makes the resource useful for teaching Earth's systems and internal heat transfer through a coherent evidence-to-model approach.