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Lava is formed when a volcano erupts magma onto the Earth's surface. As a result of cooling and interaction with gases that make up the atmosphere, magma changes its properties, forming lava . < strong> Lava is a product of volcanic activity. It has a different composition in different volcanoes. Differs in color and composition. There are three main types of lava : even-grained, bubbly, like pumice, and vitreous, like obsidian.
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