Answer:
1.A volcano is formed when hot molten rock, ash and gases escape from an opening in the Earth's surface. The molten rock and ash solidify as they cool, forming the distinctive volcano shape shown here. As a volcano erupts, it spills lava that flows downslope. Hot ash and gases are thrown into the air.
Volcanoes often form in the areas where tectonic plates make contact. The friction created by the movement between two plates can melt solid rock in the mantle and turn it into magma. This hot, molten rock creates great pressure, and over time, it finds its way up to the surface of the crust through fractures.
2.Volcanoes erupt when molten rock called magma rises to the surface. Magma is formed when the earth's mantle melts. Melting may happen where tectonic plates are pulling apart or where one plate is pushed down under another. Magma is lighter than rock so rises towards the Earth's surface.
Sixty percent of all active volcanoes occur at the boundaries between tectonic plates. Most volcanoes are found along a belt, called the “Ring of Fire” that encircles the Pacific Ocean. Some volcanoes, like those that form the Hawaiian Islands, occur in the interior of plates at areas called “hot spots.”
A statistical analysis of the Smithsonian Institution's global catalog of volcanic eruptions during the last 300 years revealed that volcanoes all over the globe are 18% more likely to erupt during the northern winter months than at any other time of year.
You will know t when a volcano will erupt when An increase in the frequency and intensity of felt earthquakes. Noticeable steaming or fumarolic activity and new or enlarged areas of hot ground. Subtle swelling of the ground surface. Small changes in heat flow.
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