Answer:
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Alaska, Delaware, Montana, North Dakota, South Dakota, Vermont, And Wyoming.
Oxygen, i believe is your answer
hope this helps :)
The limestone caves at Carlsbad Cavern were formed by hydrogen-sulfide-rich (H2S) waters. This water moved through fractures and faults in the limestone and mixed with rainwater along the way. The mixture gave rise to a substance known as sulfuric acid (H2SO4). Sulfuric acid is able to dissolve limestone, eventually creating Carlsbad Cavern. The process of cave formation ended roughly four million years ago.
A.Longitude
Longitude is the horizontal lines in the earth.
