Pumice—Extrusive
Rhyolite—Extrusive
Granite—IntrusiveSlate3
Quartzite2
Marble1
Shale3
—clay and silt sized mineral particl...
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Three Types of Rocks - Rock Discovery Activity Key

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There are various ways to classify rocks. One simple method is based on the manner in which the rocks formed. Attached is the answer key that is associated with the EdGEO teacher workshop delivered by Mining Matters at the Canadian Ecology Centre July 29 - August 2, 2013.

The three rock groups are fondly referred to as:
Baked and Squeezed (metamorphic)
Explosive Magma (Igneous)
Layered Clasts (Sedimentary)

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Three Types of Rocks - Rock Discovery Activity Key

  1. 1. Pumice—Extrusive Rhyolite—Extrusive Granite—IntrusiveSlate3 Quartzite2 Marble1 Shale3 —clay and silt sized mineral particles Sandstone2 —Sand sized (1/16 to 2 mm) particles Limestone1 —Primarily calcium carbonate

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