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2. 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.

3. 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.

4. Volcanic rock - Wikipedia

   en.wikipedia.org/wiki/Volcanic_rock

   Volcanic rock. Volcanic rocks (often shortened to volcanics in scientific contexts) are rocks formed from lava erupted from a volcano. Like all rock types, the concept of volcanic rock is artificial, and in nature volcanic rocks grade into hypabyssal and metamorphic rocks and constitute an important element of some sediments and sedimentary rocks.

5. 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.

6. Andesite - Wikipedia

   en.wikipedia.org/wiki/Andesite

   Andesite is an aphanitic (fine-grained) to porphyritic (coarse-grained) igneous rock that is intermediate in its content of silica and low in alkali metals. It has less than 20% quartz and 10% feldspathoid by volume, with at least 65% of the feldspar in the rock consisting of plagioclase. This places andesite in the basalt /andesite field of ...

7. Mesa - Wikipedia

   en.wikipedia.org/wiki/Mesa

   Table Mountain – Flat-topped mountain overlooking the city of Cape Town, South Africa; Tepui – Table-top mountain or mesa in the Guiana Highlands of South America; Tundra – Biome where plant growth is hindered by frigid temperatures; Tuya – Flat-topped, steep-sided volcano formed when lava erupts through a thick glacier or ice sheet