Definitely the burning of fossil fuels. Volcanoes emit around 100,000,000 tons of CO2 a year. Man-made emissions of CO2 comes to about 10,000,000,000 tons of CO2 per year. So volcanoes emit around 1/100th of CO2 that we do.
Man made pollution - Burning Fossil Fuels, including clear burning of rainforest land. Naturally occurring pollution (if it can be called that) - Volcanic eruptions and wildfires.
Volcanic eruptions and burning of sulfur containing coals.
Acid rain. Which can be produced either by industrial pollution (mostly sulfuric acid from coal burning), internal combustion engine pollution (mostly nitric acid), or large scale volcanic eruptions (mostly sulfuric acid).
Mass burning , poisoined by toxic gasses and destruction by lava , or laharr[ mudslides] .
No. Acid precipitation nowadays is mostly the result for the burning of fossil fuels.
No. Fly ash is ash left over from burning coal. Pumice is a porous rock produce during some volcanic eruptions.
Industry (burning of coal), smog from cars, cattle (methane), volcanic activity, dust storms, pesticides.
Usually not. The amount of carbon dioxide emitted by volcanoes is very small compared to our emissions from the burning of fossil fuels. In fact, the dust and ash emitted by volcanic eruptions often shields the earth from the sun's rays for days and sometimes weeks, bringing a cooling effect.
Burning fossil fuels: mainly coal and oil.
Cellular respiration by producers and consumers returns carbon dioxide to the atmosphere.-Cellular respiration-Volcanic eruptions-Human interference (burning of fossil fuels)
Cellular respiration by producers and consumers returns carbon dioxide to the atmosphere.-Cellular respiration-Volcanic eruptions-Human interference (burning of fossil fuels)
Usually, volcanic eruptions above water are the result of a magma-plume burning through a spot in the Earth's crust, or by the rising part of a magma convection cell. Such conditions are often found near the edges of the continental plates. There are also spots where the Earth's crust is so thin that magma breaks through even without there being a plume, such as near oceanic ridges. Most of the volcanic eruptions on this planet take place under water, near oceanic ridges.