Earth Layer Discovery

Overview

Students explore Earth’s internal layers and connect them to tectonic activity. They use labelled diagrams, a tactile model, and short evidence-based explanations to build core understanding for the unit “Unraveling Our Changing Earth”.

Learning intentions

• Students will learn that Earth has distinct layers with different properties (density and temperature conditions).
• Students will identify and label the crust, mantle, outer core, and inner core.
• Students will describe how heat and pressure inside Earth help drive tectonic processes.
• Students will practise using scientific language to explain layer roles.

Success criteria

• I can correctly label the major Earth layers on a diagram.
• I can describe one key feature of each layer (e.g., solid/liquid, thickness, role).
• I can explain how Earth’s internal heat relates to tectonic activity using correct terms.

Curriculum links

• Earth systems: describing Earth’s structure and how energy moves within Earth.
• Science as a human endeavour: using models to represent phenomena not directly observable.
• Scientific literacy: using appropriate scientific vocabulary in explanations.

Lesson structure ({total minutes})

1. 5 mins — Hook and question

• Show a simple image of Earth’s layers (blank labelled and blank unlabelled). Ask: “If we cannot see inside Earth, how can scientists know what’s there?”
• Briefly share the unit goal and today’s WALT: Discover Earth’s Layers.

2. 10 mins — Mini-lesson: Layers and roles

• Teach using a clear visual: crust (thin outer skin), mantle (thick region), outer core (liquid iron-nickel), inner core (solid iron-nickel).
• Emphasise the “why it matters”: internal heat and movement help power tectonic activity (e.g., convection in the mantle leading to plate movement).
• Keep language explicit: density/temperature, solid vs liquid, and “model” as a tool.

3. 15 mins — Tactile model exploration (station work)

• In groups of 3–4, students rotate through a station with a layered cross-section model (e.g., clay/playdough rings, foam layers, or printed layered sleeves).
• Students trace boundaries, then match layer names to the physical layers.
• Teacher prompts: “Which layer is thinnest?” “Where would shaking energy originate—near the surface or deeper?” (link to energy source).

4. 10 mins — Guided diagram labelling

• Students complete a worksheet diagram with four labelled layers and a sentence frame for each layer:
• “The ___ is ___ (thin/thick; solid/liquid). It helps ___ (connect to heat or tectonic motion).”
• Provide a word bank and sentence starters to support students with literacy difficulties and mixed levels.

5. 10 mins — Evidence check: Quick explanation

• Students choose one claim: “Earth’s heat helps drive tectonic activity.”
• They write a 2–3 sentence explanation using at least three terms from: crust, mantle, outer core, inner core, heat/energy, tectonic/plates.
• For faster completion, allow students to record verbally with a teacher check-in.

6. 5 mins — Exit ticket and reflection

• Exit ticket: label a blank diagram (no word bank) and answer: “Name one similarity or difference between two layers.”
• Collect for next lesson grouping (who needs more support with labelling vs explanation).

Resources

• Printed Earth layers diagrams: one blank, one with a word bank, one exemplar.
• Tactile layered models: foam/clay/playdough (4 colours or 4 rings) in a cross-section container.
• Word bank cards (crust, mantle, outer core, inner core, solid, liquid, thick, thin, heat/energy, tectonic activity).
• Sentence frames (one per layer) and markers/pencils for diagram work.
• Timer and station rotation cards.
• Teacher model (projected) of how to label correctly.
• Dyslexia-friendly reading supports: large font printouts, fewer words per page, and optional audio read-aloud for instructions.

Assessment

• Formative: teacher observes station accuracy and use of scientific terms during group work.
• Formative: guided diagram labelling shows whether students can correctly identify major layers.
• Summative-for-today: exit ticket (diagram labels + one short written/short verbal response).

Differentiation

• Support (literacy): provide sentence frames, a word bank, and large-font diagrams; read instructions aloud; allow verbal responses for the explanation sentence.
• Support (conceptual): use colour-coded layers and tactile tracing; check understanding with quick “thumbs up/down” prompts at key moments.
• Extension (advanced): students add a short “model limitation” comment: what the model does well and one thing it cannot show about Earth’s interior.
• Extension (advanced research prompt, aligned to unit): students list likely materials for each layer (e.g., silicate rock vs iron/nickel) and one credible source to bring to lesson 2.

Extension (optional)

• Students research the composition of each layer (what it is made of) using school-approved materials, then prepare one “composition + evidence” note for a future class display or discussion.