The third most abundant element in the Earth's crust is ________; it is more common than iron.
A. magnesium
B. fluorine
C. calcium
D. aluminum
E. tin
Answer: D
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What are the ecological concerns regarding the dramatic changes people have made in the global nitrogen cycle?
Temperatures on Earth would be lower if there were less carbon dioxide in the atmosphere.
Answer the following statement true (T) or false (F)
The ________ effect causes ocean currents to be deflected to the right of their path of motion in the Northern Hemisphere
Fill in the blank(s) with correct word
The zone that has no light is called the ________ zone
A) aphotic B) disphotic C) euphotic D) hyperphotic E) hypophotic