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Hook / Warm-Up
⏱ 4m
Engagement
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Earth Layer Quick Draw
Look at the circle on the board. If this is the Earth, where do we live? What do you think is underneath our feet if we keep digging down?
How to run it: Draw a simple circle on the board, point to the outer edge, and ask students where we live and what might be inside. Take 2-3 quick responses.
▶ Optional video follow-up - find in Deck
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Think about what might be inside the Earth, share one idea with a partner, then volunteers share with the class.
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Introduction
Introduction to Earth's Structure and the Solar System
The Earth is made of four main layers, each with different properties. The crust is the thin outer layer where we live. Below that is the mantle, a thick layer of very hot rock. Deeper still is the outer core, made of liquid metal, and at the very center is the inner core, made of solid metal. Our planet Earth is one of eight planets that orbit the Sun in our solar system. We will also learn about the three states of matter: solid, liquid, and gas.
In this resource: In the worksheet, you will label a diagram of Earth's layers, write the names of the eight planets in order from the Sun, and sort examples of matter into solid, liquid, or gas categories.
Lesson flow: First, watch the teacher model how to describe the structure of Earth and identify the properties of objects in the solar system (MS-ESS1-3). Next, practise it together as a class. Then, work independently: In the worksheet, you will label a diagram of Earth's layers, write the names of the eight planets in order from the Sun, and sort examples of matter into solid, liquid, or gas categories.
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Learning About the Solar System
Our solar system has the Sun and eight planets that orbit it. Mercury, Venus, Earth and Mars are the smaller, rocky inner planets. Jupiter, Saturn, Uranus and Neptune are the much larger outer planets, and the asteroid belt lies between Mars and Jupiter.
The outer planets
Jupiter, Saturn, Uranus and Neptune are farther from the Sun. They are giant planets made mostly of gases or icy materials and have rings and many moons.
The asteroid belt
A wide region of rocky objects orbits the Sun between Mars and Jupiter. It helps mark the division between the inner and outer planets.
Jupiter
Jupiter is the largest planet in the solar system. Its Great Red Spot is a huge storm that has lasted for a very long time.
Main idea
The main idea is describe the structure of Earth and identify the properties of objects in the solar system (MS-ESS1-3).. Students need a clear explanation of what this means before they practise it independently.
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Explicit Teaching
⏱ 18m
Concept Delivery
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Model how to compare and classify planets using location, composition, size, moons and rings. Think aloud while comparing Mercury with Jupiter, then show how the evidence places each planet in the inner or outer group. Curriculum alignment applied: explicitly teach toward HS-ESS1-4: Use mathematical or computational representations to predict the motion of orbiting objects in the solar system.; MS-ESS1-3: Analyze and interpret data to determine scale properties of objects in the solar system. Model the required knowledge or skill, then check it in guided practice and the exit task.
🎯 Teaching slides — see Deck
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Students listen, observe the diagrams and examples, repeat key terms, and respond to check-in questions during the teaching.
💬 Can you name the hottest layer inside the Earth? Which planet is the largest?
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Key Vocabulary
Crust
The thin, solid outer layer of the Earth where we live, made of rock and soil.
Mantle
The thick, very hot layer of rock beneath the crust that makes up most of Earth's volume.
Core
The center of the Earth, made of metal; the outer core is liquid and the inner core is solid.
Planet
A large, round object that orbits a star; there are eight planets in our solar system.
Solid
A state of matter with a fixed shape that does not flow, like ice, rock, or wood.
Liquid
A state of matter that flows and takes the shape of its container, like water, juice, or oil.
Modelling Steps
1
Locate each planet in relation to the Sun and the asteroid belt.
2
Compare the planets using the same features: composition, size, moons and rings.
3
Use the evidence to classify each planet as an inner or outer planet.
4
Explain the classification in a complete sentence using at least two features.
Worked Examples
Worked Example 1
Compare Mercury and Jupiter.
Mercury is small, rocky and inside the asteroid belt. Jupiter is much larger, made mostly of gas and beyond the asteroid belt. Therefore Mercury is an inner planet and Jupiter is an outer planet.
Worked Example 2
Compare Earth and Neptune.
Earth is a rocky inner planet with one moon. Neptune is a distant ice giant with rings and many moons, so it belongs to the outer-planet group.
Responsive Teaching Check
Check Understanding
Point to the mantle on the diagram and tell me: is the mantle solid or liquid, and is it hot or cold?
Expected response: The mantle is solid (or very thick/flows very slowly) and very hot.
Respond and Decide
Likely misconception: Students may say the mantle is liquid because it is hot, confusing it with the outer core.
Immediate correction: Good thinking—the mantle is extremely hot, but it is still solid rock, just under so much pressure that it can flow very slowly over millions of years. The outer core is the liquid layer made of melted metal. Let's look at the diagram again and compare the two.
Ready to continue when: Students can correctly name at least two Earth layers, recall that there are eight planets, and give one example of a solid, liquid, and gas.
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Worksheet Practice
⏱ 18m
Independent Practice
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Distribute the worksheet. Explain that students will label the Earth's layers, write the names of the eight planets in order, and sort examples of matter into solid, liquid, and gas. Circulate to check labeling accuracy, planet order, and matter classification. Prompt students who struggle: 'Look at the diagram we used—which layer is on the outside?' or 'Remember the mnemonic for planet order.'
📎 Worksheet displayed — see Deck
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Students independently complete the worksheet: labeling Earth's layers, writing planet names in order from the Sun, and classifying matter examples as solid, liquid, or gas.
Support
Provide a word bank for Earth layers and planet names. Use a simplified diagram with fewer labels. Work with a small group to classify one example of each state of matter together before independent work.
Extension
Ask students to research and write one interesting fact about each planet (e.g., Jupiter has a giant storm, Venus is the hottest planet). Challenge them to explain why the inner core is solid even though it is the hottest layer (extreme pressure keeps the metal solid).
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Plenary / Exit
⏱ 5m
Consolidation
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On your mini-whiteboard, draw a simple circle representing Earth and label the crust and one other layer inside. Then write the name of one planet that is NOT Earth. Use the exit response to check whether students have met the curriculum-linked knowledge or skill, not just whether they completed the worksheet.
🎯 Exit Ticket — see Deck
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Draw, label, and write on your mini-whiteboard, then hold it up so I can check your understanding.
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