In the United States, acid precipitation is least likely to be related to compounds of
A) nitrogen.
B) sulfur.
C) carbon.
D) oxygen.
Answer: C
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What is the most common way in which sinkholes form?
A) A small explosion of methane gas from coal beds B) A small explosion of CO2 gas from dissolving limestone C) A rising dome of salt finally reaches the surface D) The roof of a cave collapses
The gaseous oxygen in Earth's early atmosphere was a by-product of
A) photosynthesis. B) photochemical reactions breaking down ozone (O3 ) to form oxygen (O2 ). C) volcanic outgassing. D) decay of organic matter.
What are the physical states and chemical forms of matter?
What will be an ideal response
Planting rows of trees or shrubs around the periphery of a plowed field are long established farming practices that
A) serve as water reserves in times of drought. B) attract insect pests away from the crops. C) increase wind erosion and decrease soil moisture. D) decrease wind erosion and increase soil moisture.