What is the Protolith of amphibolite?
GeologyAmphibolite is a metamorphosed mafic igneous rock (basalt, gabbro) although it is usually difficult to determine the protolith because original features are often obliterated. Basalt is composed of pyroxene + plagioclase. What is the parent rock of amphibolite? Amphibolite Type Metamorphic Rock Metamorphic Type Regional Metamorphic Grade Middle Grade (Middle P – Middle T) Parent
Did they just have an earthquake in California?
Geology and GeographyWhen was the last earthquake in California? A magnitude 7.1 earthquake struck 10.5 miles north-northwest of Ridgecrest in the Mojave Desert on Friday, July 5, 2019, at 8:19 p.m., on the heels of a magnitude 6.4 earthquake that struck about 7.5 miles southwest of the Searles Valley in the Mojave Desert on Thursday, July 4,
What is the relative age relationship of faults?
GeologyThe principle of cross-cutting relationships states that a fault or intrusion is younger than the rocks that it cuts through. The fault labeled ‘E’ cuts through all three sedimentary rock layers (A, B, and C) and also cuts through the intrusion (D). So the fault must be the youngest formation that is seen. What is
What is debris flow landslide?
Geology and GeographyDebris flows are fast-moving landslides that are particularly dangerous to life and property because they move quickly, destroy objects in their paths, and often strike without warning. They occur in a wide variety of environments throughout the world, including all 50 states and U.S. Territories. What is debris flow? A debris flow is a moving
What are trace fossils used for?
GeologyTrace fossils provide us with indirect evidence of life in the past, such as the footprints, tracks, burrows, borings, and feces left behind by animals, rather than the preserved remains of the body of the actual animal itself. What can trace fossils tell us about how an animal lived? Trace fossils preserve the moment of
What does depth mean in earthquake?
GeologyIn seismology, the depth of focus or focal depth refers to the depth at which an earthquake occurs. Are shallow or deep earthquakes worse? Shallow quakes generally tend to be more damaging than deeper quakes. Seismic waves from deep quakes have to travel farther to the surface, losing energy along the way. Is 10km a
Where is the safest place to live in California from earthquakes?
GeologySacramentoSacramento Is the Safest Place to Live in California from Earthquakes. BestPlaces ranked Sacramento as the safest place to live in California from natural disasters. Where should you live to avoid wildfires? The Best Places to Live In and Avoid Fires in NorCal Ukiah Endowed with ecological wealth in the form of the mild
What is preliminary earthquake?
Geology and GeographyA foreshock is an earthquake that occurs before a larger seismic event (the mainshock) and is related to it in both time and space. The designation of an earthquake as foreshock, mainshock or aftershock is only possible after the full sequence of events has happened. What are the 4 types of earthquakes? There are four
What is Pangaea and how is it related to continental drift?
GeologyPangaea existed about 240 million years ago. By about 200 million years ago, this supercontinent began breaking up. Over millions of years, Pangaea separated into pieces that moved away from one another. These pieces slowly assumed their positions as the continent we recognize today. What is continental drift and how does it relate to Pangea?
What colors can limestone be?
GeologyLimestone is commonly white to gray in color. Limestone that is unusually rich in organic matter can be almost black in color, while traces of iron or manganese can give limestone an off-white to yellow to red color. What Colours can limestone be? Natural limestone originally deposits in shallow sea beds and the color ranges