How Volcanoes Caused Violent Uprisings In Cleopatra's Egypt loading...
How Volcanoes Caused Violent Uprisings In Cleopatra's Egypt
Distant volcanic eruptions disrupted climate, a new study suggests, causing life-giving rains along the Nile to fail.
How Climate Change Likely Heightened Harvey’s Fury loading...
How Climate Change Likely Heightened Harvey’s Fury
Several factors have conspired to make Hurricane Harvey so destructive in Texas, and warming temperatures are likely part of the problem.
About Acid Rain

Acid rain describes any form of precipitation with high levels of nitric and sulfuric acids. It can also occur in the form of snow, fog, and tiny bits of dry material that settle to Earth.

Rotting vegetation and erupting volcanoes release some chemicals that can cause acid rain, but most acid rain falls because of human activities. The biggest culprit is the burning of fossil fuels by coal-burning power plants, factories, and automobiles.

When humans burn fossil fuels, sulfur dioxide (SO2) and nitrogen oxides (NOx) are released into the atmosphere. These chemical gases react with water, oxygen, and other substances to form mild solutions of sulfuric and nitric acid. Winds may spread these acidic solutions across the atmosphere and over hundreds of miles. When acid rain reaches Earth, it flows across the surface in runoff water, enters water systems, and sinks into the soil.

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