Topics from May 2019
- When does the snow line move?
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- When does water turn into snow?
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- When is climax vegetation achieved?
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- When does the appearance of soil change?
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- When do rivers begin?
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- When does the water cycle stop?
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- When was the longest drought?
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- When does water become salty?
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- When was the longest heatwave?
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- When does the sun stop shining?
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- When are deserts cold?
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- When do we see mirages?
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- When did weather forecasting begin?
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- When is a barometer used?
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- When do fog and mist arise?
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- When do monsoons occur?
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- When was the top of Mount Everest first reached?
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- When are mountains formed?
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- When was the worst volcanic eruption?
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- When are volcanoes dormant?
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- When do we use a seismograph?
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- When do earthquake occur?
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- When do rivers run backwards?
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- When can water wear away solid rock?
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- When do waves break?
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- When do the oceans freeze?
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- When does a solar eclipse occur?
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- When does a lunar eclipse occur?
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- When is the shortest day?
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- When is summer solstice?
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