Earth Is Made of Plates

Contributor: Hannah Brooks. Lesson ID: 12032

They say being in love makes you feel like the Earth is moving under your feet. It may not sound romantic, but plate tectonics DOES make the Earth move! Learn how we float on a squishy sea of stone!

categories

Earth Science

subject
Science
learning style
Visual
personality style
Lion, Beaver
Grade Level
Middle School (6-8)
Lesson Type
Dig Deeper

Lesson Plan - Get It!

Audio:

Did you know that Earth's outer layer, the lithosphere, is made up of large plates that are constantly colliding and interacting? Watch your step!

Plate tectonics is a scientific theory stating that Earth's crust is divided into large plates on the surface.

These plates are moved by convection currents in the mantle. Convection currents, pictured below courtesy of WikiCommons, occur when warmer magma is pulled upward, while cooler magma sinks.

oceanic spreading

Image, via Wikimedia Commons, is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported, 2.5 Generic, 2.0 Generic and 1.0 Generic license.

These currents are responsible for pushing and pulling plates, causing collisions along plate boundaries.


There are two types of crustal plates: oceanic and continental. Can you predict which type is more dense? Consider this image provided by Wikimedia Commons:

active margin

This image has been released into the public domain by its author, Booyabazooka at English Wikipedia. This applies worldwide.

Which type of plate seems to be sitting lower in the asthenosphere (or mantle)?

If you guessed oceanic, you are correct! Oceanic crust is denser than continental crust. It is made of basalt, an igneous rock that forms at divergent plate boundaries. We'll take a closer look at basalt in just a moment. For now, let's focus on the continental crust, which is made up of granite. It is responsible for creating landmasses and landforms on Earth's surface.


Oceanic and continental plates interact along the edges, or as scientists sometimes call them, boundaries. There are three main types of boundaries that you will investigate by exploring an online simulation of plate boundary interactions.

First, explore Tectonic Plates and Plate Boundaries from PBS & WGBH Educational Foundation.

Now, build onto that knowledge by creating a foldable:

  1. Learn about the three types of plate boundaries by reviewing the USGS and NOAA Resources. Notice that there can be oceanic-oceanic, continental-continental, and oceanic-continental interactions. Be sure to consider and identify each type in the foldable!
  2. Organize your learning into a foldable. Fold a sheet of paper in half hot-dog style (long ways).
  3. Then, cut three flaps of equal size into one of the halves. Now, you are ready to label!

Use these resources to help complete the foldable:

Front of Flap:

Inside Left of Flap:

  1. Sketch plate movement
  2. Boundary definition

Inside Right of Flap:

  1. Describe landforms created at:
    • Oceanic-oceanic
    • Continental-continental
    • Oceanic-continental

*Not all three types have each of these interactions

Convergent

 

   

Divergent

 

   

Transform

 

   

 

  • Did you learn anything new?

Happily, plates move very slowly, leading to change over time.

  • Can you imagine if plates collided quickly?

In the Got It? section, we will look at plate identification and boundary interactions on Earth's surface.

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