This document defines volcanoes and discusses their formation and effects. It notes that volcanoes form from molten rock forced to the surface through vents. There are around 20 volcanoes actively erupting at any given time, with around 50-60 eruptions occurring each year. Volcanoes can have nonexplosive or explosive eruptions, emitting pyroclastic materials, rock fragments, and volcanic ash. Their eruptions can have significant effects like flowing lava, knocking down buildings, and altering the climate through ash and gases blocking sunlight. Common types of volcanoes include shield volcanoes, cinder cone volcanoes, and composite volcanoes.
Talk about this volcano when it erupted and what it is doing right now.
MASS, DENSITY, AND ESCAPE VELOCITY The Earth's mass is about 5.98 x 10 24 kg. The Earth has an average density of 5520 kg/m3 (water has a density of 1027 kg/m3). Earth is the densest planet in our Solar System. To escape the Earth's gravitational pull, an object must reach a velocity of 24,840 miles per hour (11,180 m/sec).
There are lots of uncertainties about why volcanoes form, because scientists have to rely on models based on rock samples and other data.
There are lots of uncertainties about why volcanoes form, because scientists have to rely on models based on rock samples and other data.
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