Geology Science Fair Project Ideas

Instructor: Kerry Gray

Kerry has been a teacher and an administrator for more than twenty years. She has a Master of Education degree.

Geology is a high interest area for many students because as it encompasses the physical composition of the Earth. This asset contains ideas for science fair projects related to geology.

Geological Science

If your students are interested in rocks, prehistoric creatures, or natural disasters, geology may be an area of interest for a science fair project. The following projects provide ideas for students in a wide range of grade levels the opportunity to explore geology through the scientific process.

Exploring Cast Fossils

Grade level: 2-6


  • plaster of Paris
  • sand
  • topsoil
  • shell
  • tweezers
  • measuring cup
  • disposable bowls


  • Pour 1 cup of topsoil in a bowl.
  • Pour 1 cup of sand in another bowl.
  • Mix ½ cup of sand with ½ cup of topsoil in a third bowl.
  • Level and pat down the contents of each bowl.
  • Press a shell down in the center of one of the bowls to leave an impression. Remove the shell with tweezers. Repeat the process with each of the other bowls, making sure to press the shell down to a similar depth for all 3 bowls.
  • Mix 1 cup of plaster of Paris with 1 cup of water.
  • Pour the plaster of Paris mixture over each of the bowls and allow to dry overnight.
  • Remove the casts and label according to the material that was in each bowl. Compare the cast fossils to determine which type of material leaves the best fossils.
  • Repeat the process 2-3 times to check for consistent results before drawing conclusions.

Eroding Rocks

Grade level: 6-12


  • distilled water
  • vinegar
  • clear jars
  • measuring cups
  • scale
  • limestone rocks
  • pH strips


  • Put 1 cup of water in a jar.
  • Fill the next jar with ½ cup of water and ½ cup of vinegar.
  • Put 1 cup of vinegar in the third jar. Label each jar according to contents.
  • Use pH strips to measure and record the acidity of each liquid.
  • Wet the rocks and weigh each to record baseline information.
  • Place a rock in each jar.
  • Each day, record the weight of each rock and the pH level of each liquid.
  • Students should either repeat the experiment 2-3 times or use 2-3 jars filled with each substance to compare data.
  • At the end of 5 days, examine the data and draw conclusions.

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