Mt Saint Helens erupted when plates collided together and made the eruption blast! The last time Mt Saint Helens erupted was July, 10, 2008!!!!!!!!!!!!!!!!!!!!!
Mount Saint Helens' magma/lava composition is different to many volcanoes and is about 64%silica and 4% water.
Mount St Helens is made up of andesitic and rhyolitic pyroclastic materials.
There are many including Mount St Helens, Mount Rainier, Mount Fuji, and Mount Vesuvius.
alternating layers of lava and tephra
by ash, rock, lava, and gas
Mount St Helens is made up of andesitic and rhyolitic pyroclastic materials.
Mount St Helens is made up of andesitic and rhyolitic pyroclastic materials.
Mount St Helens is made up of andesitic and rhyolitic pyroclastic materials.
Mount St Helens is made up of andesitic and rhyolitic pyroclastic materials.
it was the sea it made cracks in the volcano and made preasure causing it to erupt !!!
an earthquake underneath the surface or it was too hot in the crust