on April 15, 2022
Why have some open pit mines been declared Superfund sites?
GeologyWhy have some open pit mines been declared Superfund sites? The waters in the pit become highly acidic and contain high levels of toxic metals. The toxic waters of the Berkeley Pit make it one of the largest Superfund sites in the country. What are the causes of acid mine drainage? Acid mine drainage is
on April 15, 2022
What happened in the Paleocene epoch?
GeologyPaleocene Epoch (65.5 – 55.8 MYA) The Paleocene epoch immediately followed the extinction of the dinosaurs. The Earth’s climate was warmer than today, but cooler and drier than the epochs immediately preceding and following it. Europe and North America were connected, as were Asia and North America at times. What major events happened in the
on April 15, 2022
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
on April 15, 2022
How do fossils show evidence?
GeologyFossils provide solid evidence that organisms from the past are not the same as those found today; fossils show a progression of evolution. Scientists determine the age of fossils and categorize them all over the world to determine when the organisms lived relative to each other. How do fossils demonstrate evidence? Fossils are the preserved
on April 15, 2022
Where is dolostone found?
GeologyAlthough rock beds containing dolomite are found throughout the world, the most notable quarries are located in the Midwestern United States; Ontario, Canada; Switzerland; Pamplona, Spain; and Mexico. How is dolostone formed? Dolostone forms when magnesium in pore water is substituted for some of the calcium in the original limestone, or by direct precipitation. Most
on April 15, 2022
Which magma type has the highest silica content?
GeologyFelsic magmaFelsic magma has the highest silica content of all magma types, between 65-70%. As a result, felsic magma also has the highest gas content and viscosity, and lowest mean temperatures, between 650o and 800o Celsius (1202o and 1472o Fahrenheit). Which magma type has the highest silica content quizlet? RHYOLITIC magma contains more than 65%
on April 15, 2022
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
on April 15, 2022
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
on April 15, 2022
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
on April 15, 2022
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