on April 1, 2022
Which island is the largest in the Aleutian Islands chain of Alaska?
GeologyAttuAttu (the farthest from the mainland), and Unalaska, Umnak, and Unimak in the Fox Islands. What is the largest city in the Aleutian Islands? Unalaska (Aleut: Iluulux̂, Russian: Уналашка) is the chief center of population in the Aleutian Islands. The city is in the Aleutians West Census Area, a regional component of the Unorganized Borough
on April 1, 2022
What year did Thistle Utah flood?
Geology1983April 1983 obliterated the tiny town of Thistle in Utah County. In 1983, the most costly landslide in US history swept down on the tiny town of Thistle, damming up the Spanish Fork River, and severing the rail line that connects Salt Lake City with Denver. When did Thistle Utah flood? April 1983 In April
on March 31, 2022
What are the most important rock forming minerals?
GeologyThe rock-forming minerals are: feldspars, quartz, amphiboles, micas, olivine, garnet, calcite, pyroxenes. Minerals occurring within a rock in small quantities are referred to as “accessory minerals”. What are the two main rock-forming minerals? The two main families of rock forming minerals are silicate minerals and non-silicate minerals. Silicate minerals are silicon-oxygen chemical compounds. They are
on March 31, 2022
When was the continental drift theory proposed?
Geology19121912, but it was widely ridiculed and soon, mostly, forgotten. Wegener never lived to see his theory accepted—he died at the age of 50 while on an expedition in Greenland. Only decades later, in the 1960s, did the idea of continental drift resurface. Where was the continental drift theory proposed? Scientists have long noticed the
on March 31, 2022
Is San Ramon CA earthquake fault?
GeologyThe San Ramón is a thrust fault with vertical slippage which has caused the formation of the Sierra de Ramón, a 25 kilometer long mountain chain with a maximum height of 3249 meters above sea level. Is San Ramon earthquake prone? Estimates show that the San Ramon Valley experiences several quakes per week. Most are
on March 31, 2022
What is drift theory?
GeologyContinental drift is the hypothesis that the Earth’s continents have moved over geologic time relative to each other, thus appearing to have “drifted” across the ocean bed. What does continental drift theory explain? The theory of continental drift is most associated with the scientist Alfred Wegener. In the early 20th century, Wegener published a paper
on March 31, 2022
What does a terminal moraine look like?
GeologyA terminal, or end, moraine consists of a ridgelike accumulation of glacial debris pushed forward by the leading glacial snout and dumped at the outermost edge of any given ice advance. It curves convexly down the valley and may extend up the sides as lateral moraines. What does a moraine look like? If a glacier
on March 31, 2022
How many earthquakes has Iran had?
GeologyHow many earthquakes does Iran have? On average, Iran experiences one earthquake every day. From June 15th, 2021, to July 15th, 2021, Iran experienced one 5.0 magnitude earthquake, 11 4.0 magnitude earthquakes, 46 3.0 earthquakes, and six 2.0 and below quakes. In May of 2021, nearly 1,000 earthquakes occurred within the country. How many earthquakes
on March 31, 2022
What minerals are formed from magma?
GeologyThe minerals present will be olivine, pyroxene, and calcium-rich plagioclase. If the magma cools slowly underground, the product will be gabbro; if it cools quickly at the surface, the product will be basalt (Figure 3.13). Do minerals grow from magma? When magma erupts onto Earth’s surface, it is known as lava (Figure below). Minerals form
on March 31, 2022
What is the streak of epidote?
Geologyone direction Cleavage Hardness Name Cleavage Hardness Name Perfect in one direction 6 to 7 ZOISITE (Epidote Group) Ca2Al3(SiO4)3(OH) Perfect in one direction 6½ to 7 SILLIMANITE Al2SiO5 Cleavage Hardness Name How many directions of cleavage does epidote have? one direction Cleavage Hardness Name Cleavage Hardness Name Perfect in one direction 6 to 7 ZOISITE