on March 31, 2022
What is drift theory?
Regional SpecificsContinental 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
When was the continental drift theory proposed?
Regional Specifics19121912, 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
What does a terminal moraine look like?
Regional SpecificsA 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?
Regional SpecificsHow 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?
Regional SpecificsThe 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?
Regional Specificsone 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