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Finding the Density of Earth

Main Core Tie

SEEd - Grade 7
Strand 7.2: Changes to Earth over time 7.2.4

Time Frame

1 class periods of 60 minutes each

Group Size

Small Groups


Utah LessonPlans


Students will use rock samples to determine the density of Earth.


  • rocks of different densities such as basalt, granite, slate, iron (can be a nail, utensil or tool).
  • triple-beam balance
  • water
  • graduated cylinder
  • Student worksheet

Instructional Procedures

  1. Ask students if it is possible to measure the density of an object as large as Earth. Give them a chance to talk to one another for a brief time and see if they can answer it. They may think about finding mass and volume but those are difficult measurements and calculations. They may decide that samples from various places in Earth could be used to represent the whole.
  2. Show them the rocks you have gathered and read the introduction.
  3. Indicate the location of materials and read the procedures with students.
  4. Allow time to work.
  5. Ask students to post their results on the board for Earths density and see how close they come to 5.5 g/cc.


Lesson Design by Jordan School District Teachers and Staff.

Created: 10/01/2014
Updated: 02/02/2018