The three classifications of magma are mainly identified using their silica composition. Basaltic magma has the lowest silica content of 45-55% by weight. This makes it the least viscous and least explosive. Andesitic magma has 55-65% , making it more explosive and viscous. Rhyolitic magma has 65-75% silica, and is the most viscous and catastrophic.
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Explanation:
These lines, more often called borders, are created by people to separate areas governed by different groups. Sometimes, political boundaries follow physical boundaries, but most of the time you can't see them. Most maps show political boundaries. Political boundaries change over time through wars, treaties, and trade
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a or b not sure .......... hop this helps a little bit
Answer:Why are many fishing boats found near ocean upwellings?
Many marine species gather there to eat the nutrients brought to the surface.
Explanation:
I think it B or D sorry if wrong
