The Appalachian Mountains were formed when ________ and ________ collided more than 250 million years ago
A) North America; Africa
B) Africa; Europe
C) South America; Africa
D) Australia; Asia
Answer: A
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Which is the most important molecule in the ecosystem?
A) oxygen B) nitrogen C) salt D) lead E) water
The group of vertebrates with the most species, that is, the most diverse, in the sea is ________.
A. mammals B. fish C. birds D. reptiles E. amphibians
When a solution of ammonium chloride, NH4Cl, is added to a solution of lead(II) nitrate, Pb(NO3)2, a white precipitate of lead chloride, PbCl2, forms. Which of the following is the net ionic equation for this reaction?
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A fault surface is also called a ____
A)dip B)strike C)fault plane D)fault fracture E)fracture plane