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Of Earth's four overlapping spheres, which of the following does NOT involve material above Earth's surface?
Alpha Waves
Brain waves detected by an EEG that are associated with a state of relaxed alertness.
Delta Waves
Slow brain waves generated during deep sleep, indicative of the deepest stages of rest and unconsciousness.
NREM-3
The third stage of non-rapid eye movement sleep, characterized by deep sleep and the presence of delta waves.
N2 Sleep
A stage of sleep characterized by specific brain wave activity known as sleep spindles and K-complexes, marking a deeper sleep phase than N1.
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