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Distinguish between independent samples and paired samples?
Methane Gas
A colorless, odorless, highly flammable gas, CH4, which occurs naturally as a byproduct of decomposition and is used as a fuel.
Cave Collapses
The sudden failure or falling in of a cave roof or walls, often resulting in a sinkhole or depression at the surface.
Groundwater
Water that is found beneath the earth's surface, filling the spaces between rocks and forming aquifers.
Acidic Waters
Water with a pH less than 7, often resulting from natural processes such as volcanic emissions or anthropogenic sources like pollution.
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