Explosive eruptions tend to build up composite volcanoes.
A composite volcano evolved over tens of thousands of years as a result of several eruptions. The composite volcano is built up through eruptions, layer by layer, until it reaches heights of thousands of meters. Lava may have formed some layers, while ash, rock, and pyroclastic flows may have formed others. A composite volcano can also accumulate significant amounts of thick magma, which can clog up inside the volcano and force it to erupt violently.
Composite Volcano are fueled by a conduit system that accesses a magma reserve deep within the Earth. This magma can erupt either from a sizable core crater at the volcano's summit or from a number of vents scattered throughout the flanks of the composite volcano.
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Http://www.ushistory.org/us/59e.asp
this goes in more detail but basically Mikhail assumed his power on the soviet union he wanted to make the place a little more than it was when he conquered
Is that all the question, and is there any answer choices?
Answer:
Option: a. 200 million years ago
Explanation:
Million years ago, Earth had one supercontinent called Pangaea and surrounded by an ocean (Panthalassa). Alfred Wegener proposed the concept of one big continent after putting together different records of confirmation. He was able to give his theory by examining fossils of plants, trees, animals, and reptiles that found in different continents. About 200 million years ago, the supercontinent began to split up into two parts; Gondwana from Laurasia. Today's countries, including Africa, Antarctica, India, South America, and Australia are part of Gondwana, where Europe and North America from Laurasia.
