Why are some volcanoes more hazardous than others?
Some volcanic eruptions are more dangerous than others, says Dr. … Molten rock, or magma, comes under pressure, but it’s how that pressure is released that determines whether the volcano will create a violent, sudden eruption or not, she says. “If the magma is very sticky, very viscus, it will explode.
What is a hazard connected with basaltic lava flows and eruptions?
Hazards associated with basaltic lava flows and eruptions are: –burial of roads and neighborhoods by lava flows. -house fires. -Volcanic gases and methane explosions. A volcano has a Plinian eruption with an eruption column 9 kilometers high.
What type of magma is in a cinder cone volcano?
Chemical Composition. Most cinder cones form through eruption of lava of basaltic composition, although some form from lava. Basaltic magmas crystallize to form dark rocks containing minerals that are high in iron, magnesium and calcuim but low in potassium and sodium.
Is Yellowstone a cinder cone volcano?
Yellowstone National Park is a natural laboratory for the study of volcanoes. In the park, the most famous volcano is the Yellowstone Caldera, or supervolcano. Additionally, but less well-known, are numerous rhyolite domes and flows, and basaltic shields and cinder cones.
What was the most damaging type of eruption that occurred in Vesuvius in Italy?
What was the most damaging type of eruption that occurred at Vesuvius in Italy? One or more pyroclastic flows hit the city of Pompeii.
What is a breached scoria cone?
Scoria cones are small volcanoes with relatively steep sides, usually formed as the result of a single major episode of volcanic activity. Lava lakes often form in the centre of scoria cones; if the lava in such a lake breaches the side of the cone, the result is a breached scoria cone, such as Mount Elephant.
What type of volcano is Rangitoto?
shield volcano cone
Rangitoto Island is a volcanic island in the Hauraki Gulf near Auckland, New Zealand. The 5.5 km (3.4 mi) wide island is a symmetrical shield volcano cone, reaching a height of 260 m (850 ft).
What type of volcanic eruption which is very violent due to the contract between water and magma?
What happens in a phreatomagmatic eruption is usually the erupting magma is directly introduced into a body of water — possibly a crater lake, meltwater from snow or ice, seawater — and the very large contrast in heat (sometimes upwards of 1100°C between water and basalt) causes an explosion of both the water and …
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