Different isotopes of the same element differ from each other in that they have different ____________________ numbers
Fill in the blank(s) with correct word
mass
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The earliest tool-maker in the human lineage was ____________. Fill in the blank(s) with the appropriate word(s)
Differentiation of planetary embryos results in denser ________ cores and less-dense ________ mantles
A) silicate, non-silicate B) metallic, silicate C) silicate, metallic D) non-metallic, metallic
The U.S. Senate has so far opposed emissions reductions on the grounds that ________
A) it might hurt the economy B) no other nations have pledged reductions C) the United States does not emit significant amounts of greenhouse gases D) the United States already has reduced its emissions by 68% as agreed in the Copenhagen treaty E) President Obama rejected the scientific basis of global climate change
Approximately what percentage of the United State's population live in coastal areas?
A) 10% B) 25% C) 50% D) 65%