The wobble in Earth's rotational axis undergoes a periodic variation every
A) 12,000 years.
B) 23,000 years.
C) 41,000 years.
D) 100,000 years.
Answer: B
Environmental & Atmospheric Sciences
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What will be an ideal response?
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In the early 20th century, Pierre and Marie Curie discovered that radioactive decay produces
heat. Indicate whether the statement is true or false.
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A) Canada B) Italy C) Japan D) Norway E) Scotland
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