Exploring Earth's Amazing Inner Layers
A Journey to the Center of Our Planet Grade 7 Science 60 Minutes
Learning Goals - What I Can Do Today
I can identify and name the four main layers of the Earth I can describe key characteristics of each layer I can label a color-coded diagram of Earth's structure I can use scientific vocabulary like solid, liquid, thickness, and temperature
What Do You Already Know?
Think about what's inside the Earth Share one thing you know or wonder about No wrong answers - just curious minds! Let's build our knowledge together
Earth's Four Amazing Layers
The Crust - Our Rocky Home
Thinnest layer - like the skin on an apple Where we live and find mountains, oceans Made of solid rock and soil Only 5-70 kilometers thick Coolest layer with temperatures we can survive
The Mantle - Earth's Hot Middle
Thickest layer - about 2,900 kilometers deep Made of hot, semi-solid rock that can flow slowly Orange-red color from extreme heat Temperature reaches 3,000°C Like thick, hot honey that moves very slowly
The Two Cores - Earth's Center
{"left":"Outer Core: Liquid iron and nickel\nCreates Earth's magnetic field\nTemperature: 4,000-5,000°C\nMoves and swirls constantly","right":"Inner Core: Solid iron and nickel\nHottest part - up to 6,000°C\nSolid due to extreme pressure\nSize of the Moon!"}
Hands-On Layer Labeling
Work with a partner Use your color-coded diagram Label each layer with its name Write one amazing fact about each layer Use your assigned colors: Crust=Brown, Mantle=Orange, Outer Core=Yellow, Inner Core=Red
Quick Check: Can You Remember?
Which layer do we live on? Which layer is the thickest? Which layer creates Earth's magnetic field? Which layer is hottest but solid?
Amazing Earth Layer Facts
The inner core spins faster than the rest of Earth! If you could dig to the center, it would take 42 minutes to fall through The mantle contains 84% of Earth's volume Earth's magnetic field flips every few hundred thousand years The crust under oceans is much thinner than under continents