Earth's Layers & Plate Tectonics

MS-ESS2-2 • How geoscience processes have changed Earth's surface

Earth isn't a solid ball of rock — it's built from distinct layers, and the outermost layer is broken into moving plates that float on the layer beneath them. This page covers what's inside Earth, how the plates move, and a hands-on puzzle activity that shows students physical evidence for plate tectonics.

What's Inside Earth?

Earth is made of four main layers, each with a different state of matter, temperature, and composition. The crust we stand on is actually the thinnest layer by far.

Earth's layers A cross-section diagram of Earth showing the crust, mantle, outer core, and inner core, each labeled with approximate thickness and state of matter. Crust Solid, 5-70 km thick Mantle Hot, slowly flowing rock Outer core Liquid iron & nickel Inner core Solid, ~5,400°C

Earth's Layers Interactive Organizer

A nested, layered organizer that mirrors Earth's actual structure — students build outward from the inner core, recording location, thickness, composition, and temperature for each layer as they go.

  1. Print the organizer pages onto colorful paper, one color per layer.
  2. Students research and record facts about each layer on its page.
  3. Cut along the bold outside edges, keeping the tab sections attached.
  4. Assemble starting with the inner core, gluing each tab to the next layer outward.
  5. The finished organizer opens like a globe, layer by layer, in the student's notebook.
Photo: Completed Earth's Layers nested organizer

Types of Plate Boundaries

Tectonic plates interact in three distinct ways, and each produces different surface features — from towering mountain ranges to ocean trenches to the fault lines that cause earthquakes.

Types of tectonic plate boundaries Three cross-section diagrams showing convergent, divergent, and transform plate boundaries, with arrows indicating the direction of plate movement at each. Convergent Plates collide Divergent Plates pull apart Transform Plates slide past At each boundary type, the surface above responds differently — mountains, rift valleys, or earthquakes along a fault.

Boundary Type Foldables

A flip-style foldable lets students lift each flap to compare the three boundary types side-by-side, writing what they observe under each one in their own words.

Photo: Convergent boundary foldable flap

Convergent Boundary

Two plates move toward each other, often forming mountain ranges or deep ocean trenches where one plate sinks beneath another.

Photo: Divergent boundary foldable flap

Divergent Boundary

Two plates move apart, allowing magma to rise and form new crust — the process responsible for mid-ocean ridges.

Photo: Transform boundary foldable flap

Transform Boundary

Two plates slide past each other horizontally, building up stress that releases suddenly as an earthquake.

Tectonic Plates Puzzle: Check for Understanding

Students cut apart continent puzzle pieces and reassemble them into Pangaea, then compare that arrangement to today's map. The activity makes continental drift tangible and pairs with written questions about how geologists know the continents were once joined.

Photo: Continent puzzle pieces assembled into Pangaea
Photo: Plate Tectonics Puzzle title page
At each boundary type, the surface above responds differently — mountains, rift valleys, or earthquakes along a fault.
MS-ESS2-1 • MS-ESS2-2 • MS-ESS2-3

Want the Complete Geology Unit?

This page covers just one piece of a full NGSS-aligned Earth's Systems: Geology unit — over 370 pages of interactive notebook activities, mini posters, organizers, mini research projects, and Check for Understanding pages covering the rock cycle, plate tectonics, volcanoes, earthquakes, weathering, erosion, and the evidence for plate tectonics.

View the Full Unit on TPT  
Copyright © Book Units Teacher 2000–Present  |  Gay Miller