Scoria
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Scoria, also called volcanic cinder, is a pyroclastic, highly vesicular, dark-colored volcanic rock formed by ejection from a volcano as a molten blob and cooled in the air to form discrete grains cal
Basaltic scoria lapillus from the Taal Volcano
Pine trees growing on the slope of Cinder Cone, a volcanic cone of scoria in Lassen Volcanic National Park, California
Violent strombolian eruption of scoria from a lava fountain at the Kīlauea Iki crater, 1959. Note cinder cone being constructed to the right of the fountain and the plume of scoria emanating from it.
Tuff moai with red scoria pukao on its head.
Cinder track
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A cinder track is a type of race track, generally purposed for track and field or horse racing, whose surface is composed of scoria, also called cinders. For running tracks, many cinder surfaces have
Scoria
…Puna Pau was the source of reddish scoria used to carve the pukao (topknots) for the famous moai statues, and even for the main bodies of some moai. Cinder track – Race track whose surface is composed of cinders Extrusive rock – Mode of igneous volcanic rock formation…
Equipment used for putting chalk lines on a cinder track.
Billy Mills winning the 10,000 metres at the 1964 Summer Olympics, the last Olympics to be held on a cinder track