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The Air Around Us
P3 Science · Unit 1 · Grade 3
Explore Earth's atmosphere — the blanket of air that makes life possible!
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5 Layers
Learn & Stories
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Match Game
Name + Definition
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Order Layers
Low → High
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Hangman
Guess the Name
📚 Unit 1 has more sections coming soon — check the sidebar!
🌐 Section 1: Layers of the Atmosphere
Earth's atmosphere has 5 main layers — from closest to farthest from Earth
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What is the Atmosphere?
The air blanket surrounding planet Earth
The atmosphere is a thick layer of gases that surrounds Earth. Think of it like a giant invisible blanket — it holds air, traps warmth, and protects all life on our planet. Without the atmosphere, Earth would be a frozen, lifeless rock!
⭐ Key Benefits of the Atmosphere
🌬️ We Can Breathe
The atmosphere contains oxygen (21%) that all animals and humans need to survive.
🌡️ Keeps Earth Warm
It traps heat from the sun like a greenhouse, keeping temperatures suitable for life.
🛡️ Protects from UV Rays
The ozone layer in the stratosphere blocks harmful ultraviolet rays from the sun.
☄️ Burns Up Space Rocks
Meteors burn up as they enter the mesosphere, protecting Earth's surface.
🌧️ Makes Weather & Rain
Clouds, rain, and wind all happen in the troposphere, giving us fresh water.
🔇 Carries Sound
Air molecules in the atmosphere allow sound waves to travel so we can hear.
💡 Quick Fact: The atmosphere is about 10,000 km thick but 99% of its air is packed in just the bottom 30 km!
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1. Troposphere
"Tropo" = Greek for "change"
📏 0 – 12 km above Earth
☁️
⛅
🌧️
⛈️
🌈
✈️
🧠 Story: "TROPO is where all the TROUBLE (weather) happens — it's the layer we TROMP around in every day!"
The troposphere is the lowest layer where we live and breathe. It contains 78% nitrogen and 21% oxygen. This is where all weather happens — clouds, rain, storms, snow, and rainbows! Airplanes fly in the upper troposphere.
🌡️ Gets colder higher up
🌬️ Most air is here
☁️ Clouds form here
✈️ Planes fly here
🌱 Life depends on it
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2. Stratosphere
"Strato" = Latin for "layer/spread"
📏 12 – 50 km above Earth
🛡️
Ozone Layer ☀️ 🚀
Ozone Layer ☀️ 🚀
🧠 Story: "STRATOSPHERE is a STRAIGHT peaceful road — no weather, just the OZONE SHIELD protecting us from the sun!"
The stratosphere holds the famous ozone layer (O₃) which acts like Earth's sunscreen, blocking harmful UV rays. Unlike the troposphere, it gets warmer as you go higher! Weather balloons and supersonic jets fly here.
🛡️ Ozone layer is here
☀️ Blocks UV rays
🌡️ Gets warmer higher up
🎈 Weather balloons here
🚫 No weather here
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3. Mesosphere
"Meso" = Greek for "middle"
📏 50 – 80 km above Earth
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☄️
🌠
✨
❄️ Coldest layer!
🧠 Story: "MESO is the METEOR-MUNCHING MIDDLE layer — it burns up shooting stars to protect us below!"
The mesosphere is the middle layer and the coldest part of the atmosphere (down to -90°C!). It burns up meteors and space rocks before they reach Earth — those streaks we call "shooting stars" burn here!
❄️ Coldest layer (-90°C)
🌠 Burns up meteors
🛸 Too high for planes
🔬 Hard to study
⭐ Shooting stars here
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4. Thermosphere
"Thermo" = Greek for "heat"
📏 80 – 700 km above Earth
🛸
🌌
🌃
💫
🔥 Up to 2000°C!
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🧠 Story: "THERMOSPHERE is THERMOS-hot! But the air is so thin you wouldn't feel it — the ISS space station floats up here!"
The thermosphere is extremely hot (up to 2,000°C) because it absorbs solar radiation. But the air is so thin you wouldn't feel the heat! The ISS orbits here, and beautiful auroras (Northern/Southern Lights) appear in this layer.
🔥 Very hot (2000°C)
🛸 ISS orbits here
🌌 Aurora Borealis here
📡 Radio waves bounce here
☀️ Absorbs solar X-rays
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5. Exosphere
"Exo" = Greek for "outside/beyond"
📏 700 – 10,000 km above Earth
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🌙
⭐
✨
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📡 Satellites orbit here
🧠 Story: "EXO means EXIT — it's where the atmosphere EXITS into outer space! Satellites wave goodbye to Earth here."
The exosphere is the outermost and thinnest layer of Earth's atmosphere. It gradually fades into outer space! GPS and weather satellites orbit here. There are very few gas molecules — it's almost outer space!
🌌 Almost outer space
🛰️ Satellites orbit here
📡 GPS satellites here
💨 Almost no air
♾️ Fades into space
📊 Quick Summary Chart
| # | Layer | Height | Key Feature |
|---|---|---|---|
| 1 | ☁️ Troposphere | 0–12 km | Weather, life, oxygen |
| 2 | 🛡️ Stratosphere | 12–50 km | Ozone layer, UV protection |
| 3 | 🌠 Mesosphere | 50–80 km | Burns meteors, coldest |
| 4 | 🔥 Thermosphere | 80–700 km | ISS, auroras, hottest |
| 5 | 🌌 Exosphere | 700–10,000 km | Satellites, fades to space |
🎮 Game Zone
Test your knowledge of atmosphere layers!