The innermost layer is the core with a radius of about ___________ km.
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The process of pollination by birds is also known as
Helium is added to the oxygen supply of deep sea divers because it is _________
Limonitic ore is the ore of which metal?
Limonite is one of the two principal iron ores, the other being hematite, and has been mined for the production of iron.
Earth is also known as _______.
Sullage water is_______
A bomb explodes on the moon. You will hear its sound on earth after _________
Who coined the term "Ecology"?