In this fun and easy geology science experiment, we’re going to try and determine if there is air in rocks.
  • Lava rocks, broken bricks or clay, or other porous rocks
  • Clear two liter bottle 
  • Scissors
  • Water
  • Magnifying glass


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  1. Remove the label from the two liter bottle.
  2. Carefully cut the top off of the two liter bottle. 
  3. Fill the bottle two thirds of the way full with water.
  4. Put the rock specimens in the water.
  5. Use the magnifying glass and see if air bubbles escape from the rocks.


Air in Rocks: Fun Facts for Kids about How Air Gets Trapped


Fun Facts about Air in Rocks and How It Gets There:


  1. Pores and Voids: Rocks can contain tiny spaces called pores or voids where air can become trapped during the rock's formation.

  2. Sedimentary Rocks: Sedimentary rocks, formed by the accumulation of sediment, often have more air spaces due to the arrangement and compaction of different particles.

  3. Vesicles: Some volcanic rocks, like pumice, are filled with small holes called vesicles that are formed by trapped gas bubbles during the volcanic eruption.

  4. Fossils and Organisms: Fossilized remains of ancient organisms, such as shells or plant matter, can create hollow spaces within rocks, allowing air to be preserved.

  5. Fractures and Cracks: Rocks with fractures or cracks can provide pathways for air to enter and get trapped within the rock.

  6. Tectonic Activity: The movement of Earth's tectonic plates can create spaces and cracks in rocks, which can subsequently trap air.

  7. Weathering and Erosion: Weathering and erosion processes can create openings and fractures in rocks, allowing air to enter and become trapped.

  8. Geological Time: Air can become trapped in rocks over millions of years, providing a glimpse into the ancient atmosphere and environmental conditions.

  9. Rock Identification: The presence of air in rocks can sometimes be observed by examining their texture, density, or through the use of specialized equipment.

  10. Exploration and Study: The study of air in rocks helps scientists understand the geological processes that occurred during the rock's formation and provides insights into Earth's history.

Uncover the hidden air pockets within rocks and explore the fascinating ways it becomes trapped!


I hope you enjoyed this super quick tutorial and enjoyed trying to discover if there is air in rocks!
Pro tip: Use this activity to create some excitement around discussions or lessons about rocks, the rock cycle, geology, and more!
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Question 1: How can air become trapped in rocks? A) Volcanic eruptions B) Fossilized remains C) Fractures and cracks D) All of the above

Correct answer: D) All of the above

Question 2: Which type of rock is known for containing air-filled vesicles? A) Igneous rocks B) Sedimentary rocks C) Metamorphic rocks D) None of the above

Correct answer: A) Igneous rocks

Question 3: What can the study of air in rocks help scientists understand? A) Earth's history B) Environmental conditions C) Geological processes D) All of the above

Correct answer: D) All of the above