What is volcanic debris?
Natural EnvironmentsBGS Research — Volcanoes. Debris flows, also known as lahars when they involve volcanic material, are mixtures of sediments and water that flow down the slopes in response to gravity. What does volcanic debris mean? Moving masses of rock, soil and snow that occur when the flank of a mountain or volcano collapses and slides
What are large crystals?
Regional SpecificsAn igneous rock with large crystals probably indicates that the rock formed deep within the Earth, since it is typically warmer deep inside the Earth than near the surface. These are called intrusive rocks, and they have a phaneritic texture (from the Greek “phanerous” meaning visible). What is the name of the large crystals? Examples
What is the legend of Popocatepetl and Iztaccihuatl?
Regional SpecificsIn Aztec mythology, Iztaccíhuatl was a princess who fell in love with one of her father’s warriors, Popocatépetl. The emperor sent Popocatépetl to war in Oaxaca, promising him Iztaccíhuatl as his wife when he returned (which Iztaccíhuatl’s father presumed he would not). What is the legend of Popocatepetl & Iztaccíhuatl a love story? Popocatepetl and
What is cross bedding in geology?
Regional SpecificsIn geology, cross-bedding, also known as cross-stratification, is layering within a stratum and at an angle to the main bedding plane. The sedimentary structures which result are roughly horizontal units composed of inclined layers. What are the main types of cross-bedding? The three types of cross-bedding under this classification are simple, planar, and trough. The
Is there a fault line in Virginia?
Regional SpecificsMost earthquakes in Virginia are not associated with a known fault, but occur within three distinct seismic zones: the Eastern Tennessee Seismic Zone (ETSZ) includes Lee County in far southwestern Virginia; the Giles County Seismic Zone (GCSZ) extends through the New River Valley; and the Central Virginia Seismic Zone … Is Virginia near a fault
What type of metamorphic rock is anthracite?
Regional SpecificsAnthracite Coal is a black, shiny metamorphic rock. Coal forms from plant material and has no grains. Anthracite is the rarest and most expensive form of coal. What type of rock is anthracite? Anthracite Coal is a black, shiny metamorphic rock. Coal forms from plant material and has no grains. Anthracite is the rarest and