You have two hours for this test. Answer all questions. This photo shows two large stratovolcanoes, made mostly of andesite lavas and ash. Explain the tectonic environment in which these kinds of volcanoes form. This photo shows the same volcanoes as above.
White arrows show features surrounding the nearest volcano.
Explain what these features probably are and how they might form. Round scars like this sparsely dot the Earth's landscape. They vary in size from 1 km or so up to 100's of km in diameter. They contain evidence for highly disturbed rocks and high pressure minerals. Explain how these features formed.