diatreme
diatreme Carrot-shaped volcanic vent that has formed by explosive action: it is often filled with coarse, angular fragments injected by gas fluidization, e.g. kimberlites. Diatremes typically cut through non-volcanic basement rocks, and contain fragments derived from great depths.
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Diorite , diorite •Hamite, samite •marmite • Semite • Vegemite •eremite • Hashemite • Fatimite •chromite • Edomite • sodomite •stalagmite • Elamite • dolomite… Psilophytales , Skip to main content
Psilophytales
Psilophytales (psilophytes) Primitive pteridophytes, which were the earliest vascular plants, from the Silurian an… xenolith , xenolith An inclusion or enclave of a preexisting rock in an igneous rock. Xenoliths are often derived from the country rocks that have been invaded… Geode , Geode
Geodes are hollow rock masses that are lined with crystals that have grown toward the center of the cavity. Geodes are usually roughly spherica… Radial Symmetry , Skip to main content
radial symmetry
radial symmetry The arrangement of parts in an organ or organism such that cutting through the centre of the str… Sill , Sill
A sill is a formation of igneous rock found in features such as mesas, hogbacks, and cuestas. Although sills can become exposed, sills are forme…
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diatreme