Which gemstone is the blue variety of the mineral beryl?
Answer
Aquamarine
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What is the name of the boundary between Earth's liquid outer core and solid inner core?
Answer
Lehmann discontinuity
What is the name of the superheated molten rock beneath Earth's surface?
Answer
Magma
Which mineral group includes muscovite and biotite and is known for splitting into thin sheets?
Answer
Mica
What is the name of the dark volcanic rock that makes up most of Earth's oceanic crust?
Answer
Basalt
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What is the name of the boundary between Earth's liquid outer core and solid inner core?
Answer
Lehmann discontinuity
What is the name of the earthquake magnitude scale now preferred for comparing very large earthquakes?
Answer
Moment magnitude scale