Geology Rocks: Comparing Rocks

Contributor: Meghan Vestal. Lesson ID: 11102

A rock is a rock, right? No big deal. Actually, rocks are all different, from the way they are formed to how they look! Learn to become a rock detective from Jessi and Squeaks, and make trading cards!


Earth Science

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

Lesson Plan - Get It!


Are you able to determine what type of rocks are being displayed in the image above just by looking at them? Guess not all rocks are alike!

In the first three Related Lessons of this series, you learned about igneous, sedimentary, and metamorphic rocks.

If you missed or need to review those previous Geology Rocks! Related Lessons, you can find them in the right-hand sidebar.

You learned how each type of rock is formed, characteristics of each rock, and examples of each rock. In today’s lesson, you will compare and contrast what you have learned.

Copy the following chart onto a sheet of paper:

Rock Type How Is It Formed? Where Is It Formed? Characteristics Examples How Do We Use These in Everyday Life?


Complete the chart using the information you learned in the previous Related Lessons and information found on the following websites:

Geologists — people who study rocks and fossils — are able to quickly examine the characteristics of rocks and determine what type of rock they are looking at.

  • Using the information in your chart, can you determine which of the rocks from the beginning of the lesson are igneous?
  • Sedimentary?
  • Metamorphic?
  • What characteristics caused you to draw those conclusions?

Discuss your responses and observations with a teacher or parent.

Then, continue on to the Got It? section to practice your rock hound skills!

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