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Why do you collect rocks? Ed and a scientist collect a boulder for the Hall of Planet Earth.
Ed and a scientist collect a boulder for the Hall of Planet Earth.
   
Chuck Said
Geologists collect rocks in order to piece together the history of the Earth.

We bring rocks back to the lab when we need special equipment to study their composition and form. For example, we use something called a mass spectrometer to learn more about the chemicals that are in rocks. We also try to re-create the conditions that might have formed the rock.

Sometimes geologists collect rocks to put them on display in museum exhibitions, so everyone can enjoy them.