The average depth of the photic zone is ________ in open ocean waters
a. 200 meters (660 feet)
b. 600 meters (2,000 feet)
c. 100 meters (330 feet)
d. 10 meters (33 feet)
c
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In a battery, if the following oxidation-reduction reactions takes place normally:Mn2O3 + ZnO ? 2 MnO2 + Zn What reaction would be taking place if you were charging the battery?
A. ZnO ? Zn B. 2 MnO2 + Zn ? Mn2O3 + ZnO C. Mn2O3 ? MnO2 D. all of the above E. none of the above
The Maunder Minimum
A) occurred during the Little Ice Age. B) saw high levels of sunspots. C) is a consequence of the weak Sun paradox. D) caused a significant change in the eccentricity of Earth's orbit. E) has been deduced by examining ice-core samples from Greenland.
Geographers are interested in the spatial context of things
Indicate whether the statement is true or false
On Earth, the Sun passes directly overhead at 25° north latitude ________ times a year
A) 0 B) 2 C) 1 D) 4