Answer:
The correct answer is A the Caribbean Sea and the Pacific Ocean.
Explanation:
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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.
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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 +
Answer:Geographic featured that acted as norther borders of the Roman Empire at its height were: Rhine River, Danube River, Carpathian Mountains, and the Black Sea.
Answer:
Ethiopia is most densely populated in the highlands where most people live as farmers. In the 1980s, the Socialist regime made unsuccessful attempts to forcibly relocate people away from the civil war and gather the people in new villages. Ethnically, the population is very mixed and hundreds of different languages are spoken.
More and more Ethiopians are seeking refuge in the cities today than ever before. The biggest reason why more and more Ethiopians are moving to the cities is that wages are higher there than in the countryside and that there are more jobs to choose from (in the countryside it is mostly agriculture). Despite that, only 20% of the population lives in cities and other urban areas.
