on April 2, 2022
How many eons are there in geologic time?
GeologyThree eons are recognized: the Phanerozoic Eon (dating from the present back to the beginning of the Cambrian Period), the Proterozoic Eon, and the Archean Eon. Less formally, eon often refers to a span of one billion years. What are the 4 geological eons? For example, the entire age of the earth is divided into
on April 2, 2022
What landforms are in the mountains?
Geologymountain, landform that rises prominently above its surroundings, generally exhibiting steep slopes, a relatively confined summit area, and considerable local relief. Mountains generally are understood to be larger than hills, but the term has no standardized geological meaning. What are 5 major landforms? A landform is a feature on the Earth’s surface that is part
on April 2, 2022
What cities are on the Hayward fault?
GeologyNearly 3 million people live directly on top of the active Hayward Fault. This includes the communities of Oakland, San Leandro, Hayward, Fremont, Richmond, Castro Valley, Union City and Berkeley. Where does the Hayward Fault start and end? The Hayward fault runs through the East Bay hills from San Jose through Richmond. The Hayward Fault
on April 2, 2022
What is the theory of plate tectonics?
GeologyWhat is the theory of plate tectonics explain? The theory of plate tectonics states that the Earth’s solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere, the molten upper portion of the mantle. Oceanic and continental plates come together, spread apart, and interact at boundaries all over the planet. Where
on April 2, 2022
What is the average speed of a tsunami?
GeologySince the average depth of the Pacific ocean is 4000 m (14,000 feet) , tsunami wave speed will average about 200 m/s or over 700 km/h (500 mph). How fast is a tsunami? In the deep ocean, a tsunami can move as fast as a jet plane, over 500 mph, and its wavelength, the distance
on April 2, 2022
What are large crystals?
GeologyAn 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
on April 2, 2022
What is the legend of Popocatepetl and Iztaccihuatl?
GeologyIn 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
on April 2, 2022
What is cross bedding in geology?
GeologyIn 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
on April 2, 2022
Is there a fault line in Virginia?
GeologyMost 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
on April 2, 2022
What type of metamorphic rock is anthracite?
GeologyAnthracite 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