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• Volcanoes are classified as active, inactive, and extinct.
• Active volcanoes exhibit volcanic activity such as rumbling, crater glow, eruption, and earthquakes within the last 10,000 years.
• Inactive volcanoes show no historical record of eruption in the past 10,000 years.
• Extinct volcanoes have no record of eruption. They do not have a magma supply.
• Blasts are hot bursts of trapped gases that push their way through solid barriers.
• Dome growth refers to a mound of lava that grows inside the carter, called cryptodome. If it grows outside the volcano, it is called an exodome.
• Lahar is also called mudflow or flow of volcanic debris.
• Lava flow refers to the molten rocks that move down the slope of volcanic vents.
• Pyroclastic flow refers to glowing hot material that moves down the slope of an erupting volcano and comes in contact with the surface.
• Pyroclastic surges are volcanic materials of gases, ash, rock fragments, and water extruded above the ground.
• Tephra falls may consist of combinations of pumice, scoria, thick rock fragments, and crystals.
• Tsunamis are series of sea waves caused by the displacement of large volumes of water because of an underwater earthquake or volcanic eruption.