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After the eruption, with no ground cover, erosion (both wind and rain) was the main weathering agent. Most weathering is time dependent, more time, more weathering.
Exposure to strong sunlight can also act as a weathering agent. Most of what could be weathered was ash and deadwood.
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∙ 11y ago
Wiki User
∙ 13y agofelsic rock
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Does Mount St Helens spew pahoehoe pillow Aa or Blocky lava?
Mount St Helens produces blocky lava.
What kind mountain is mount st Helens?
Mount St. Helens consists of lava rock interlayered with ash, pumice and deposits, together with layers of basalt and andesite.
Is mount st Helens high in silica or low in silica?
Mount St Helens produces mostly dacite lava, which is relatively high in silica.
How did the people die of mount st Helens?
Mount St Helens was an active volcano..... put 2 and 2 together. Lava and Humans dont mix very well!
What type of rock layer does mount st helens have?
As Mount St. Helens is a volcano the slopes would be covered in layers of volcanic dust and lava.
Does Mount St Helens spew pahoehoe pillow Aa or Blocky lava?
Mount St Helens produces blocky lava.
Is Mt St Helens a lava dome?
No. Mount St. Helens is a stratovolcano. There is a lava dome in the crater.
What made mt st Helens so explosive?
Mount Saint Helens' magma/lava composition is different to many volcanoes and is about 64%silica and 4% water.
Does Mount St Helens lava flow violently or quietly?
Lava can't flow violently. Highly explosive eruptions such as the 1980 eruption of Mount St. Helens do not produce lava flows: they produce clouds of ash, gas, and pumice. Mount St. Helens has produced "quiet" lava flows at times.
What kind mountain is mount st Helens?
Mount St. Helens consists of lava rock interlayered with ash, pumice and deposits, together with layers of basalt and andesite.
Is mount st Helens high in silica or low in silica?
Mount St Helens produces mostly dacite lava, which is relatively high in silica.
What is mount st helens made out of?
alternating layers of lava and tephra
What material is mount st helens made of?
by ash, rock, lava, and gas
How did the people die of mount st Helens?
Mount St Helens was an active volcano..... put 2 and 2 together. Lava and Humans dont mix very well!
What type of rock layer does mount st helens have?
As Mount St. Helens is a volcano the slopes would be covered in layers of volcanic dust and lava.
What kind of lava does mount st Helens produce?
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.
Does Mount Rainier erupt felsic lava?
Like many stratovolcanoes, Mount St Helens has produced material of mafic, felsic, and intermediate composition. Overall, much of the material is itermediate. The 1980 eruption and later activity have produced dacite, which has an intermediate-felsic composition
