Earth
What is a sudden collapse and downward motion of ice and rocks down a mountainside?
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What is the natural process by which rocks break down into smaller chunks?
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In what month does the vernal equinox take place in the northern hemisphere?
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Which of these habitats is a dry one usually with sand and can sometimes be very hot?
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What is the term used to classify igneous rocks that are light in both color and gravity?
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On October 11, 1999 the world population hit a milestone of how many?
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What is the current era in the geologic time scale?
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