火山

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Volcanoes are openings in the Earth's crust where hot melted rock, called magma, rises from deep below the surface.
A volcano is a hole in the Earth's crust from which hot molten rock (magma) rising from deep below the surface emerges.
The Earth's crust is divided into large pieces called tectonic plates that constantly move very slowly.
The Earth's crust is divided into large pieces called tectonic plates that move endlessly and very slowly.
When these plates collide or move apart, they create pressure and heat that causes rock to melt into magma.
When these plates collide or move apart, they generate pressure and heat that melts rock into magma.
The magma becomes lighter than the surrounding rock and begins to rise through cracks in the crust.
The magma becomes lighter than the surrounding rock and begins to rise through cracks in the crust.
When this hot magma reaches the Earth's surface, it erupts as lava, ash, and gases, creating a volcanic eruption.
When this hot magma reaches the surface, it erupts as lava, volcanic ash, and gas, causing a volcanic explosion.
Over time, repeated eruptions build up layers of cooled lava and ash, eventually forming a volcano mountain.
Over time, repeated eruptions build up layers of cooled lava and volcanic ash, eventually forming a volcanic mountain.