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Which plate boundary has the largest and deepest earthquakes?

Which of these would likely produce the most reliable absolute age of its formation from radiometric dating techniques? 

The Precambrian represents what fraction of earth history? 

Topographic highs typically define which of these features?

Which of these is a product of desert weathering?

Which best describes the most damaging to life (of the many negative effects) of the ocean becoming more acidic?

Under current conditions of climate change, glaciers are retreating at what rates?

The number one factor responsible for triggering landslides is ______.

Which of these landslides caused flooding?

Which of these relatively recent volcanic eruptions formed a caldera?