Fresh water and salt water together cover 3/4 of the earth's surface.
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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:
The longevity of the agricultural product is the most important factor when it comes to the closeness of the agricultural activity to the central market.
Explanation:
When it comes to agricultural activities, it is very important to take into consideration the type of product that is produced and its characteristics, so that the distance from the central market is adequate. This comes from the fact that not all agricultural products have the same reslience or longevity, and also they differ in how good they can bear transportation, changing temperature, etc.
Agricultural products that have short longevity and are not suitable for long-distance transportation should always be as close as possible to the central market as if they are not there will be big losses which doesn't do a favor to anyone. On the other hand, the agricultural products that have long longevity and are easy and not problematic for long-distance transportation can be produced far away from the central market without any problem.
Answer:
In Africa, El Niño conditions are associated with increased rainfall in East Africa and decreased rainfall in southern Africa, West Africa, and parts of the Sahel
Explanation:
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