Superheated water suddenly erupts from the Old Faithful geyser.
Giant
ano erupts. ash
lava magma
2. Magma breaks through Earth’s crust. Hot ash, lava, and debris cover the land for hundreds of kilometers.
3. Smaller blasts continue for months. Ash may rise 40 km in the air. The land collapses and a caldera forms.
OCTOBER 2014 13 13
ash
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