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19 Cards in this Set
- Front
- Back
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How many people died from the Mt. St. Helens eruption?
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57
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What is "Dome Forming"?
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The attempt of the volcano to rebuild itself.
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How tall was the peak of Mt. St. Helens before it erupted compared to after?
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5th tallest peak in the state of Washington before eruption, now the 37th.
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What happens during a Phreatic Eruption (crater)?
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Hot ash meets water.
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What determines the type of eruption that will occur in a volcano?
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Magma
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What kind of lava only forms under water?
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Pillow Lave
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The Earth is _____ miles or _____ kilometers around the equator.
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25,000 miles or 40,000 kilometers (40k).
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How long would it take to walk all the way around the equator?
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6.2 school years
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How old is the Earth?
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4.6 billion years old
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Who must create/enact a national park?
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(act of) Congress
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Who establishes a national monument, and who must approve it?
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The President can establish a national monument, and Congress must approve it.
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When it comes to national parks, who is the department of interior, and who is in charge of the operations?
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The NPS is the department of interior, and the superintendent is in charge of the operations.
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What units are used in the geologic time scale?
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Eras, Periods, and Epochs.
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What is the Precambrian Era, and what is it divided into on the geologic scale?
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The Precambrian Era is the name for the span of time before the Phanerozoic eon (now), and is divided into eons on the geologic scale.
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What are epochs?
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An instant in time chosen as the origin of a particular era; serves as a reference point from which time is measured.
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What material exists in ALL magma?
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Silica
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What is lava viscosity?
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Resistance to flow
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Where is basalt generally located?
Andesite? Rhyolite? |
1. ocean floor, divergent plate boundaries, lava plateaus
2. convergent plate boundaries, ocean continent subduction zones 3. convergent plate boundaries and hot spots |
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Which of the rocks from cooled lava have the least, intermediate, and greatest amount of silica in them?
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Basalt=least (basic)
Andesite=intermediate Rhyolite=greatest (acidic) |
