Which component of the A soil horizon is responsible for supplying nutrients for plants?
A. humus
B. hummus
C. hamas
D. hanukkah
Answer: A
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Groundwater accounts for what percentage of Earth's freshwater?
A) 20% B) 75% C) 97% D) 3% E) 30%
Europeans are the only people to have developed geography
Indicate whether the statement is true or false.
What hypothesis has been presented for the close parallel relationship of the magnetic field and the rotation axis?
A) Rotation causes spiraling convection currents in the outer core. B) Rotation causes spiraling convection currents in the outer mantle. C) Rotation causes spiraling convection currents in the inner mantle. D) Rotation causes spiraling convection currents in the inner core.
Usually, we hear of issues concerning the border between the United States and Mexico; however, the border between the United States and Canada is actually the longest international border in the world
Indicate whether the statement is true or false