Consider a situation in which overharvesting causes the number of fish in a population to become drastically smaller, which causes genetic variation in that fish population to decrease over a few generations. this is an example of

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).