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Our transcription: The desert, like any environment on Earth, is the result of a critical balance of geologic conditions. Climate, topography, and plate tectonics interact to determine whether an area will be, say, a desert, or a forest, or a prairie grassland. Human activity, however, is capable of disrupting this natural balance, triggering a chain of events that can cause deserts to invade a non-desert region. This process called "desertification" can be frightening rapid and its consequences staggering.
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