For the first question, it is cos48=2/3
Answer:
Whats the question here? if its a true or false question then its true. unless this want a question.
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A volcano with an empty magma chamber would be called a caldera
Explanation: During certain types of explosive eruptions, a volcano's magma chamber may empty enough for an area above it to subside, forming a type of larger depression known as a caldera.