Environmental Effects:
Geosphere: The geosphere is affected by tephra deposits from volcanic ash and lava flows. These left extremely fertile soil that led to agricultural prosperity in the areas surrounding the volcano.
Hydrosphere: The hydrosphere was affected because there was a minor tsunami on the second day of the eruption. Also, the water was pouted by toxins released. All the pyroclastic material and ash from the explosion would have been completely ruined any nearby water source, making it unsafe. There was also a pyroclastic flood.
Atmosphere: The atmosphere was affected because it contains volcanic gases including laze plumes(Hydrochloric acid and seawater) and Hydrogen Fluoride. Smoke and ash created a haze that cover the area and flowed down in the wind to the south of Italy.
Biosphere: The biosphere was affected because all of the surrounding areas were destroyed and almost every living creature was perished as a result of the eruption. But, due to the pyroclastic material, the animals and people are still in the position they were when they were buried.
Human Effects:
Pompeii and the cities of Herculaneum and Naples nearby frequently experienced seismic activity. Because of these frequent earthquakes, there was no alarm for the people when the earthquake occurred under Mount Vesuvius. The citizens were taken by surprise during the eruption that occurred shortly after the observation of Pliny. The response was that people tried to find shelter or attempted to evacuate the city. The ash cloud covered the sun and fell from a sky at a rate of six inches an hour. The next day, Pompeii was blanketed in volcanic gas. Most people died instantly by either inhaling or being buried under the pile of heated gas. The city was never recovered and now serves as a tourist attraction.There was about 10,000-20,000 deaths. The area is deserted but is allowed plenty of tourists. Citizens in the surrounding cities were relocated to less dangerous areas to prevent another occurrence like Pompeii. Since then, no one has ever dared to live near Mount Vesuvius, but plenty of foreigners come to take pictures of this memorable, yet catastrophic event. Though, according to some rock evidence, scientists believe that there is some eruptions that were not observed nor recorded.