Rock Identification with Willsey: Intro to Igneous Rocks!

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Rock Identification with Willsey: Intro to Igneous Rocks!

Rock Identification with Willsey: Intro to rock types and useful ID tips

Identifying Igneous Rocks -- Earth Rocks!

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Learning Geology - Igneous Intrusive Rock

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Igneous Rock: Most Up-to-Date Encyclopedia, News & Reviews

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