on April 2, 2022
Is felsic lava hotter than mafic lava?
GeologySo, mafic lavas are hot , low in silica and volatiles, and have relatively low viscosity. They flow easily outward from the vent (where it comes out of the ground), and may travel great distances before completely solidifying. Felsic lavas are not as hot, high in silica and volatiles, and have a high viscosity. Is
on April 2, 2022
How do people survive earthquake facts?
GeologyIf an earthquake happens, protect yourself right away: If you are in a car, pull over and stop. Set your parking brake. If you are in bed, turn face down and cover your head and neck with a pillow. If you are outdoors, stay outdoors away from buildings. If you are inside, stay and do
on April 2, 2022
How many planes of cleavage does hornblende have?
GeologyTwo directions Physical Properties of Hornblende Chemical Classification Silicate Luster Vitreous Diaphaneity Translucent to nearly opaque Cleavage Two directions intersecting at 124 and 56 degrees How many cleavage planes are in hornblende? two Hornblende is black and, like all amphibole minerals, is characterized by two perfect cleavages that intersect at about 60° or 120°. Does
on April 2, 2022
Does lava rock disintegrate?
GeologyLow maintenance – Unlike organic mulch, lava rock does not disintegrate or decompose. It lasts a very long time and requires almost no maintenance. How long does lava rock last? Lava rocks will last 1 to 2 years or longer depending on how often you use your fire pit. Over time lava rocks will deteriorate
on April 2, 2022
What is the other name for seismic sea waves?
GeologyTsunami is a Japanese word meaning ‘harbor wave’, and is sometimes called seismic sea wave or, erroneously, tidal wave. What are called seismic waves? What are Seismic Waves? Seismic waves are caused by the sudden movement of materials within the Earth, such as slip along a fault during an earthquake. Volcanic eruptions, explosions, landslides, avalanches,
on April 2, 2022
How many fault lines are in the Bay Area?
GeologyThe three faults in the Bay Area most likely to have a damaging earthquake are the Hayward Fault, the Calaveras Fault and the San Andreas Fault. Where is the fault line in Bay Area? This fault is about 74 mi (119 km) long, situated mainly along the western base of the hills on the east
on April 2, 2022
Why do folds occur?
GeologyFolding- Folding occurs when tectonic processes put stress on a rock, and the rock bends, instead of breaking. This can create a variety of landforms as the surfaces of the folded rocks are eroded. Anticlines are folds shaped like an arch, and synclines are shaped like the letter ‘U. What is folding and faulting? Faulting.
on April 2, 2022
What time span is encompassed by Precambrian time?
GeologyPrecambrian, period of time extending from about 4.6 billion years ago (the point at which Earth began to form) to the beginning of the Cambrian Period, 541 million years ago. What time span is encompassed by Precambrian time quizlet? Precambrian Time: the time interval that began with the formation of the earth and ended about
on April 2, 2022
Where are glacial valleys found?
GeologyThey are found also in other major European mountains including the Carpathian Mountains, the Pyrenees, the Rila and Pirin mountains in Bulgaria, and the Scottish Highlands. A classic glacial trough is in Glacier National Park in Montana, USA in which the St. Mary River runs. Where can valleys be found? Valleys are most commonly drained
on April 2, 2022
Which texture is associated with plutonic rocks?
GeologyA phaneritic texture is developed by the slow cooling and crystallisation of magma trapped within the Earth’s crust and is characteristic of plutonic rocks. What is the texture of a plutonic rock? The main way to tell a plutonic rock is that it’s made of tightly packed mineral grains of medium size (1 to 5