Why is Mount Pinatubo famous?
Regional SpecificsPinatubo 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
How do fossils show evidence?
Regional SpecificsFossils 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
Where is dolostone found?
Regional SpecificsAlthough 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
What are the two major groups of minerals?
Regional SpecificsAll 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?
Regional SpecificsA 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?
Regional SpecificsA 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