Answer:
C. plagioclase
Explanation:
From the magma silicate crystals are formed successively when the magma temperature reaches the typical melting temperature for each type of crystal. The first crystals formed at high temperatures can then change their composition or dissolve again. In this way the crystals already formed contribute their ions, molecules and atoms to magma and combine again forming new crystals whose melting temperature is lower than that of the first crystals formed. The new crystals are said to be stable at the lowest temperatures set now. These processes of change are called reactions. As several successive reactions occur as the magma temperature decreases the ordered series of reactions is called the BOWEN series in honor of the Canadian scientist who formulated this concept. There are two types of reactions, the continuous reaction and the discontinuous reaction.
<u>
By continuous reaction a crystal formed at high temperatures such as a plagioclase rich in the Ca2 +</u> component gradually varies its composition by replacing a portion of the Ca2 + ions with the Na + ions and a portion of the Al3 + ions with the Si4 + ions. To maintain its neutrality, the replacement of Ca2 + by Na + is coupled with the replacement of Al3 + by Si4 +. The series of continuous reaction starts from the plagioclase rich in Ca2 +, passes through several plagioclase of intermediate composition towards the plagioclase rich in Na +
On this day in 1517, the priest and scholar Martin Luther approaches the door of the Castle Church in Wittenberg, Germany, and nails a piece of paper to it containing the 95 revolutionary opinions that would begin the Protestant Reformation
Answer:
Kilimanjaro
Explanation:
The name of Africa's tallest peak (19,341 feet above sea level) comes from two local languages: Swahili and Chagga. When combined, the words translate to "Shining Mountain" or "White Mountain." Alternate names given to Kilimanjaro throughout history translate to "Mountain Where Birds Cannot Fly" and "Mountain of Silver Moons." The Chagga people believe that a spirit lives atop the peak and will cause sickness to some who climb. Anthropologists think this is likely their method for explaining altitude sickness, caused by attempting to climb Kilimanjaro too quickly.
The Gobi is a large desert<span> region in </span>Asia<span>. It covers parts of </span>northern<span> and </span>northwestern China<span>, and of southern </span>Mongolia<span>.</span>