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basalt a dark, heavy rock that is created by lava flowing from volcanoes.
eruption When there is an eruption, something breaks open and material comes out. If there is an eruption of a volcano, there is an explosion inside it. The mountain breaks open and lava pours out.
lava Lava is very hot, melted rock that comes out of a mountain called a volcano. The lava flows down the sides of the volcano to the ground. Sometimes it flows across land and into the sea. Later, lava gets cool and becomes new land.
magma hot, liquid matter beneath the earth's surface that cools to form igneous rock. Magma that reaches the earth's surface, as when a volcano erupts, is called lava.