The uppermost layer of a soil consisting of organic material is called the _______ horizon
a) A
b) B
c) C
d) E
e) O
Ans: e) O
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What may result from weathering/erosion?
A) Sedimentary rock turns to fragments. B) Igneous rock melts. C) Metamorphic rock turns into sedimentary rock. D) Sedimentary rock turns into metamorphic rock.
What is the valence shell electron configuration of all the noble gases except for helium?
A) ns2 B) ns2np3 C) ns2np6 D) np8
The free fall of rock through air is called a(n) ____________________
Fill in the blank(s) with correct word
A company is growing algae in big tanks to make fish food. However, the algae is not growing very quickly, and they suspect either phosphorus, nitrogen, or iron is limiting. What could the company do to figure out which nutrient is limiting?
a. Add phosphorus to one tank, nitrogen to another, and iron to a third, and see which treatment increases algal growth. b. Add phosphorus, iron, and nitrogen to all tanks, and see which nutrient increases algal growth. c. Add phosphorus to all tanks, because phosphorus is the nutrient that limits algal growth. d. Add nitrogen to all tanks, because nitrogen is the nutrient that limits algal growth.