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Explanation:
This deep oceanic trench is caused by. A the collapse of an empty magma chamber in a large volcano.
Answer: Even geologists can have a difficult time identifying minerals. There are over 4,000 known minerals, and approximately 80-100 new ones are discovered each year. Of all these, only a few hundred are considered common. To help with identification, geologists must look closely at the physical properties of a mineral.
Explanation: