A volcano is an opening in the Earth's surface, which opens downward to a pool of molten rock.
When pressure builds up under the Earth, this molten rock erupts and is forced out through the opening.
It spills out into the air and onto the land.
Mount Erebus is an active volcano in Antarctica.
The world's largest volcano is in Hawaii.
The largest volcano in our solar system is on Mars.
Under the Earth's crust there is a layer of red-hot, sticky rock called magma.
This red-hot rock bursts out through narrow crack or weak spots in the crust.
The hot rock pours out of a volcano down it's sides and over the land.
The volcano sends melted rock and clouds of thick, dusty ash into the sky.
Under the surface of the Earth, there are huge slabs called plates that fit loosely together like a jigsaw.
These plates sometimes move.
The movement causes one plate to slide on top of another.
When this happens , magma is squeezed up between the two plates.
When pressure builds up under the Earth, this molten rock erupts and is forced out through the opening.
It spills out into the air and onto the land.
Mount Erebus is an active volcano in Antarctica.
The world's largest volcano is in Hawaii.
The largest volcano in our solar system is on Mars.
Under the Earth's crust there is a layer of red-hot, sticky rock called magma.
This red-hot rock bursts out through narrow crack or weak spots in the crust.
The hot rock pours out of a volcano down it's sides and over the land.
The volcano sends melted rock and clouds of thick, dusty ash into the sky.
Under the surface of the Earth, there are huge slabs called plates that fit loosely together like a jigsaw.
These plates sometimes move.
The movement causes one plate to slide on top of another.
When this happens , magma is squeezed up between the two plates.