This is a very good question, so I'm going to thank you for asking it in the first place. I would like to first tell you one amazing thing about the Lechuguilla caves were that they weren't formed like other average caves, up to down, when acidic water drips, and forms caves below us. The story of Lechuguilla was that oil from reservoirs not very far away under ground, and a chemical compound by the name of Hydrogen Sulfide gas piled up in there, and the culmination of the molecules underground, it created, well, a very, very strong acid. This is known as sulfuric acid. What the sulfuric acid did was pound through layers of the limestone existing underground. And what this did was form the Lechuguilla caves. And like at the beginning, the unique thing about the Lechuguilla was that this process made it form bottom to up, instead of top to bottom.
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http://liberalsenateforum.ca/issue/canada-in-the-world/
<span>The angular size of the moon in our sky is almost exactly the same as the angular size of the sun in our sky. This can be seen and noticed during a full eclipse, by some remarkable coincide, the Earth's moon, from our point of view, is at the perfect distance from Earth in relation to the sun, to have almost matching sizes, allowing for the complete blocking of light when the moon and sun align.</span>
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Pangaea was a formation of the Earth's continents as one mass. The "Present" section is what the Earth looks like today. In the in-between panels, trace the continents gradually moving apart to reach their eventual state.
Differences in temperature and in density of seawater drive deep ocean currents.
