sulfur dioxide and carbon dioxide
Mount St.Helens is a an active stratovolcano.
Mount St. Helens consists of lava rock interlayered with ash, pumice and deposits, together with layers of basalt and andesite.
Mount St. Helens, an active stratovolcano, is of the composite type.
Mount St. Helens is an active stratovolcano.
The material produced by the eruptions of Mount St. Helens have varied over time, but the eruptions of recent decades, including the 1980 eruption, have involved dacite magma, whish is of intermediate-felsic composition. The famous 1980 eruption produced ash and pumice rather than lava.
Mount St.Helens is a an active stratovolcano.
Mount St. Helens consists of lava rock interlayered with ash, pumice and deposits, together with layers of basalt and andesite.
Volcanic mountain.
Mount St. Helens, an active stratovolcano, is of the composite type.
Mount St Helens primarily erupts dacite.
what kinds of trees live around mout. st. helens
Mount St. Helens is an active stratovolcano.
The material produced by the eruptions of Mount St. Helens have varied over time, but the eruptions of recent decades, including the 1980 eruption, have involved dacite magma, whish is of intermediate-felsic composition. The famous 1980 eruption produced ash and pumice rather than lava.
Mount Vesuvius is a stratovolcano six miles(9 kilometers) east of the city of Naples, Italy.
Interesting question. After the explosive eruption, the gas content of the rhyolitic magma should have decreased enough to allow obsidian to form. It is the right kind of lava. However, most of the lava dome in the Mount St. Helens caldera is dacite, which is "grainier" than obsidian, indicating that it cooled too slowly to have a "glassy" appearance. Obsidian flows must cool quickly to prevent crystal formation. It is possible that some obsidian was formed, but subsequently covered by dacite. I have not been able to find any reports that mention obsidian recovered from the Mount St Helens lava dome.So the answer is a qualified no, we don't have any evidence of obsidian flows from Mount St Helens.Incidentally, there are individuals and companies selling products they call "helenite" or "St Helens Obsidian", which is a synthetic material created by fusing volcanic ash (which may or may not have come from Mount St Helens).
There have been volcanic eruptions all over the world in the last 5 years. While the majority of them have been non-explosive, there are others that occurred in Indonesia, Africa, and Chile that were much larger.
The eyjafjallajokull volcano is a shield volcano