Chapter 4 Rocks and Igneous Rocks (.pdf)
Chapter 4 Rocks and Igneous Rocks (.pdf)
Chapter 4 Rocks and Igneous Rocks (.pdf)
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Exceptions to the Definition<br />
Some rocks are not formed of minerals<br />
Noncrystalline, glassy volcanic rocks such as<br />
obsidian <strong>and</strong> pumice<br />
Coal which is formed from compacted plant remains
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