Examlex
Natural selection acts directly on the genotype of an organism.
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Fissure
A long, narrow opening or crack, especially one in the ground or in rock formations.
Eruption Column
A rising column of hot gases, tephra, and rock fragments that erupts high into the atmosphere.
Pyroclastic Flow
A fast-moving cloud of hot volcanic gases, ash, pumice, and rock fragments that generally travel down the flanks of a volcano; synonym: ash flow.
Volcanic Dome
A round-shaped mound formed over a volcanic vent by the slow eruption of viscous lava.
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