Earth

What is petroleum as found in the earth, before it is refined?

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Which type of irrigation is most commonly used throughout the world?
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What is the name of the single continent that existed early in Earth's history?
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What is a tornado that doesn't reach the ground called?
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How many times does lightning strike the Earth every second?
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Where in Arizona is the sun blocked 10% of the time?
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Which mineral is not likely to be a replacement mineral in fossils?
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From where does 90% of the water vapor in the air come?
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What is the low pressure area along the equator called?
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