Dr. alvarez studies how the degeneration of certain components of nerve cells in the brain might contribute to the development of multiple sclerosis. dr. alvarez's work best exemplifies the subfield of psychology.

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).

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