Why is Mount Pinatubo famous?
GeologyPinatubo is most notorious for its VEI-6 eruption on June 15, 1991, the second-largest terrestrial eruption of the 20th century after the 1912 eruption of Novarupta in Alaska. Complicating the eruption was the arrival of Typhoon Yunya, bringing a lethal mix of ash and rain to towns and cities surrounding the volcano. What is interesting
What are the two major groups of minerals?
GeologyAll minerals, however, can be classified into two main groups—silicate minerals and nonsilicate minerals—based on the chemical compositions of the minerals. What are the major groups of minerals? Silicates, oxides, sulfates, sulfides, carbonates, native elements, and halides are all major mineral groups. Silicates. Oxides. Sulfates. Sulfides. Carbonates. Native Elements. Halides. What are the two main
Why did mount okmok erupt?
GeologyA strong explosive eruption at Okmok began abruptly at 1143 on 12 July after about an hour of rapidly escalating earthquake activity. Ash and gas from the initial explosions reached at least 15 km (50,000 ft) a.s.l on 12 July and drifted as a large cloud S and E above the North Pacific. What caused
Do earthquakes occur before volcano erupts?
GeologyA few large regional earthquakes (greater than magnitude 6) are considered to be related to a subsequent eruption or to some type of unrest at a nearby volcano. However, volcanoes can only be triggered into eruption by nearby tectonic earthquakes if they are already poised to erupt. Do earthquakes precede volcanic eruptions? “Volcanic eruptions are
What type of rock is best for absolute dating?
GeologyIgneous rocks are the best types of rock samples to use for radiometric dating. When igneous rock forms, elements are separated into different minerals in the rock. Thus, when they form, minerals in igneous rocks often contain only a parent isotope and none of the daughter isotope. Which type of rock dating is used to
What does compaction and cementation mean?
GeologyCompaction is when deposited sediments are smooshed together by the weight of water and other sediment that has settled on top of it. Cementation is when the sediments are glued together by the minerals that come out of supersaturated water. What does compaction and cementation mean in the rock cycle? Compaction is the squeezing of
Where are the Allegheny highlands?
GeologyThe Allegheny Highlands forests are a temperate broadleaf and mixed forests ecoregion of North America, as defined by the World Wildlife Fund.… Allegheny Highlands forests Area 116,400 km2 (44,900 sq mi) Country United States States Pennsylvania, New York and Ohio Conservation What cities are in the Allegheny Mountains? Development. There are very few sizable cities
Why does it rain after an earthquake?
GeologyDoes rain come after an earthquake? Higher grades of precipitation in seismic area rainfall tended to occur 1 day after an earthquake and the proportion of heavy torrential rain reached a maximum of 1.3% 2 days after an earthquake. FIGURE 5. Grade of daily precipitation (units: mm) for seismic area rainfall in the influential period.
What was the biggest earthquake in Colorado?
GeologyPast and Possible Future Earthquakes The largest known earthquake in Colorado occurred on November 7, 1882 and had an estimated magnitude of 6.6. The location of this earthquake was probably in the northern Front Range west of Fort Collins. When was the last big earthquake in Colorado? It was the largest natural earthquake to affect
What is the major difference between granite and basalt?
GeologyMain Differences Between Basalt and Granite Basalt is darker colored and is composed of mafic. On the other hand, granite is light-colored and is composed of felsic. Basalt is an extrusive igneous rock that erupts onto the surface where they cool quickly to form small crystals. What are the main differences between granite and basalt?