If you see lightning and hear the thunder 15 seconds later, then the lightning stroke is about ____ miles away
A) 45
B) 15
C) 5
D) 3
D
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Explain how radioactive decay has always warmed the earth from the inside, and nuclear fusion has always warmed the earth from the outside
A) Much heat was released as matter coalesced to form the earth. This heat resulted in the production of radioactive isotopes, which still reside within the earth today and are a source of internal heat. Our primary external source of heat is from the fusion of hydrogen within the sun. B) The inner Earth is made of fissioning heavy elements while the sun is made of lighter fusing elements. C) Radioactive elements have been within Earth since it was created while the sun is made of fusing hydrogen atoms. D) All of the above are reasonable answers.
The ____________________ orogen is the earliest mountain-building event that documents a complete
____________________ cycle of opening and closing ocean basins. Fill in the blank(s) with the appropriate word(s).
Australopithecus sediba is most likely the direct ancestor of Homo sapiens
a. True b. False
In order for a human population to be sustainable, its actual numbers must be ________
A) above its ecological footprint B) below its ecological footprint C) above the carrying capacity D) above its biocapacity E) below the carrying capacity