Sunspots are dark because   a. regions of the photosphere are obscured by material in the chromosphere.   b. shock waves move through the photosphere.   c. the sun rotates differentially.   d. the strong magnetic field inhibits the currents of hot gas rising from below.   e. they radiate their energy into space faster than the rest of the photosphere.

Q: What was Sir John Murray’s main contribution to the HMS Challenger expedition and to oceanography?

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Q: Please find the question

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A: We’ll answer the first question since the exact one wasn’t specified. Please submit a new question s...

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