An atom's mass number is 13 and its atomic number is 6. How many neutrons are in its nucleus?
A) 13 B) 6 C) 19 D) 7
D
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Which of the following causes the formation of large crystals such as pegmatite?
A) high fluid content of magma B) high heavy metal content of magma C) high silica content of magma D) high solidification factor of magma
Tens of thousands of years ago, languages may have been joined together as
A) branches. B) superfamilies. C) groups. D) lingua franca. E) families.
The concentration of ____________________ is close to 21 percent (by volume) in the upper stratosphere (the same concentration as in the trophosphere), but without proper breathing apparatus you would not be able to survive there
Fill in the blank with correct word.
The theory of plate tectonics can be used to explain all of the following EXCEPT:
A. the presence of magnetic anomalies on the ocean floor. B. the presence of glacial deposits in what are now tropical areas. C. the distribution of earthquakes and volcanoes. D. the origin of mountains. E. the origin of the Earth's core.