The uppermost layer over the earth's surface is called the ______.
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Chlorophyll was first isolated and named by
What is the name of the asteroid that causes Geminid meteor shower display around 15 December of every year?
Which play of Shakespeare's was recently claimed to be dated wrongly?
Which country's constitution is the world's longest?
What is the SI unit of pressure?
The pitch of a sound depends on its ____.