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1. What is the process called where deep, cold, nutrient-rich water rises toward the ocean surface?

Downwelling

Upwelling

Outwelling

Thermohaline Circulation

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2. The 'Tree Line' on a mountain is best defined as:

The line where snow begins to appear

The highest elevation at which trees can grow

The border between two different forest types

A path cut through a forest for hiking

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