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Earth

Driving Question: How did the formation and evolution of Earth increase complexity?

Earth, the planet where we make our home, didn’t appear overnight. Earth took billions of years to slowly evolve into its current form—4.567 billion years to be exact.

Learning Objectives:

  1. Describe the formation of the Earth.
  2. Explain how Earth changed over time, including evaluating the evidence for plate tectonics.
  3. Analyze the physical processes that shaped Earth’s surface.

Vocab Terms:

  • collective learning
  • continental drift
  • Earth
  • geology
  • gravity
  • planet
  • plate tectonics
STEP 1

Opener: Earth

Teaching Tools

To kick off this lesson, ask your students if they want to be lava surfers. You might get some puzzled looks, but whether they want to or not, we’re all lava surfers! You can share this article External link  with them or read passages aloud to get them thinking about plate tectonics.

This activity is a bit of a challenge in terms of showing student work. Once your students complete their matching exercise, you can do one of two things: 1) Have them use the snipping tool and snip their answers to turn them into your LMS as an image; or 2) share the answer key so students can check their work. The Google Slide activity does not “lock” results once students move the images the way some other matching edtech tools might.

We have finally touched down on Earth, and there’s already a ton going on beneath our feet. Let’s explore what’s rumbling down there!

STEP 2

The Early Earth

The early days of the Earth were a time of fire and liquid metals. Imagine you’re in a super-safe spacesuit, traveling across a very different planet than the one you’ve known.

What Was the Young Earth Like? External link

The early Earth was not a pleasant place to be. How did it change to become a place that supports life?
STEP 3

The Theory of Plate Tectonics

Teaching Tools

The plate tectonics activity aligns with Standard 3 of the National Geography Standards (NGS) and helps students analyze spatial concepts such as dispersion and distribution. Explore Big History’s geography resources and see how each activity aligns to the NGS in this alignment and placement doc External link .

For decades people believed that something as huge as a continent could not move. But the discovery of plate tectonics proved them wrong.

STEP 4

Continents in Motion

Teaching Tools

Did you know that there’s an easy way to give students feedback on their claim-testing skills? The Claim Testing: Feedback Form External link breaks down the elements so you can assess how well they did crafting a claim and a counterclaim and if their responses are historically accurate. You can adapt the feedback form to focus only on the skills that are assessed by crossing out sections of the form that don’t apply to a particular activity. 

Now you know a little about plate tectonics! But it’s just important to know how we as humans made these discoveries. Your claim-testing skills are about to come in handy.

STEP 5

Closer: Earth

Teaching Tools

Informal writing routines like the Unit Notebook are incorporated in each unit of the course. These routines are part of how students learn the content and help them make connections to core Big History concepts. Learn more about writing routines on pages 3–4 of our Writing Guide External link

From the Big Bang to the formation of Earth, you’ve covered a lot of time and space. Now that you’re back on solid ground, how has your thinking changed?

Extension Materials
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Plate tectonics was a pretty “Earth-shaking” theory. Try this graphic biography and assessment to learn how it became widely accepted.
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A “Girl Talk” Geological Revolution

Marie Tharp spent much of her career in the shadows of male scientists. Yet her work helped prove the theory of continental drift and our understanding of plate tectonics.

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Unit 2 Assessment

Teaching Tools

We know that writing a full DBQ essay might be challenging for middle-school students. This optional assessment can be adapted in a few ways: 1) Have students focus on the prewriting exercise, modeling how to unpack the prompt and write a claim. You can use the table on page 2 of the Claim Warm-Up activity External link to help students parse the prompt and craft their claim. 2) Create learning stations for student groups to examine a smaller selection of the DBQ sources and decide how each source helps to answer the prompt. 3) Shorten the essay in the writing activity to a paragraph or have students create a different product such as a Google Slide or infographic.

This writing assignment is available through Khan Academy’s Writing Coach, an AI-powered tool that guides students through the writing process and provides feedback—without doing the thinking or writing for them. Learn more and find a direct link to this assignment in our Writing Coach Guide External link .