Cool rapidly on the surface after a volcanic eruption, resulting in tiny crystals or a glassy texture. Examples include basalt , pumice , and obsidian . 2. Sedimentary Rocks: Layers of Time
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Includes the Mohs Scale of Hardness , the periodic table of elements, and a glossary of geological terms. Key Features Cool rapidly on the surface after a volcanic
: Formed primarily from the skeletal fragments of marine organisms. the periodic table of elements
Highlighting geological wonders like Devils Tower , Giant's Causeway , and Shiprock Pinnacle to show how rocks shape the landscape.
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