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2. Volcanic rock - Wikipedia

   en.wikipedia.org/wiki/Volcanic_rock

   The terms lava stone and lava rock are more used by marketers than geologists, who would likely say "volcanic rock" (because lava is a molten liquid and rock is solid). "Lava stone" may describe anything from a friable silicic pumice to solid mafic flow basalt, and is sometimes used to describe rocks that were never lava , but look as if they ...

3. Upper and Lower Table Rock - Wikipedia

   en.wikipedia.org/wiki/Upper_and_Lower_Table_Rock

   volcanic plateaus. Upper Table Rock and Lower Table Rock are two prominent volcanic plateaus located just north of the Rogue River in Jackson County, Oregon, U.S. Created by an andesitic lava flow approximately seven million years ago and shaped by erosion, they now stand about 800 feet (240 m) above the surrounding Rogue Valley.

4. Basalt - Wikipedia

   en.wikipedia.org/wiki/Basalt

   Basalt (UK: / ˈbæsɔːlt, - əlt /; [1] US: / bəˈsɔːlt, ˈbeɪsɔːlt /) [2] is an aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low- viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the surface of a rocky planet or moon. More than 90% of all volcanic rock on Earth is basalt.

5. List of places with columnar jointed volcanics - Wikipedia

   en.wikipedia.org/wiki/List_of_places_with...

   Basalt columns in the Rhön, North Bavaria, Germany. Volcanic rock columns, Milos, Greece. Ponta da Ajuda, Azores, Portugal. Basalt rocks near Detunata Goală east of Bucium, Romania. Columnar jointing in the basalt of the Giant's Causeway in Northern Ireland. Fingal's Cave, Staffa Island, Scotland.

6. Dee Wright Observatory - Wikipedia

   en.wikipedia.org/wiki/Dee_Wright_Observatory

   Created. 1935. Operated by. U.S. Forest Service. Dee Wright Observatory is an observation structure at the summit of McKenzie Pass in the Cascade Mountains of Oregon. The structure is an open shelter constructed with lava stone. It is located in the midst of a large lava flow, and offers an exceptional view of numerous Cascade peaks.

7. Obsidian - Wikipedia

   en.wikipedia.org/wiki/Obsidian

   It is an igneous rock. [6] Obsidian is produced from felsic lava, rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. It is commonly found within the margins of rhyolitic lava flows known as obsidian flows. These flows have a high content of silica, granting them a high viscosity.