Science

What scientist discovered that sunspots occur in an eleven-year cycle?

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Which of these is one of the three basic cloud forms?
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Which form of energy can we see with the naked eye?
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What does Earth's tilted axis mainly affect?
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How many major time zones does the earth have?
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According to Ohm's Law, what would the resistance be in a circuit with 40 volts and 8 amps?
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John Glenn was the first American to orbit the earth, in how long a flight?
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Which Pioneer spacecraft first visited the planet Saturn?
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Which of these is a cause of water pollution?
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