| Question Answer | A volcanic hazard made up of rocky particles about the size of a grain of sand. volcanic ash | The main hazard from a quiet volcanic eruption is ______ ________. lava flows | Tall, volcano in which layers of lava alternate with layers of ash. composite volcanoes |
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What is the main hazard from a quiet volcano eruption?
| Question Answer | What is the main hazard from a quiet volcanic eruption? lava flows | Tall, cone shaped mountains in which layers of lava alternate with layers of ash are called composite volcanoes | Which type of rock would you expect to form as the result of an explosive eruption? pumice |
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Which of the following volcano hazards is made up of rocky particles about the size of a grain of sand quizlet?
Which of the following volcano hazards is made up of rocky particles about the size of a grain of sand?
lava flows
.
What is an eruption of ash cinders bombs and gases from a volcano is called?
Pyroclastic flow
. The expulsion of ash, cinders, bombs, and gases during an explosive volcanic eruption.
What happens if a volcano magma is high in silica the volcano will probably?
If a volcano's magma is high in silica, the volcano will probably
erupt explosively
. A type of rock that you would except to form as the result of an explosive eruption is pumice. A volcano that may erupt again at some time in the distant future is dormant.
Which of the following volcanic hazards is made up of rocky particles about the size of a grain of sand less than 2mm )?
Which of the following volcano hazards is made up of rocky particles about the size of a grain of sand?
lava flows
.
What is the largest active volcano on earth?
Rising gradually to more than 4 km (2.5 mi) above sea level,
Hawaii's Mauna Loa
is the largest active volcano on our planet. Its submarine flanks descend to the sea floor an additional 5 km (3 mi), and the sea floor in turn is depressed by Mauna Loa's great mass another 8 km (5 mi).
What are 3 negative effects of volcanoes?
Volcanoes spew hot, dangerous gases, ash, lava, and rock that are powerfully destructive. People have died from volcanic blasts. Volcanic eruptions can result in additional threats to health, such as floods,
mudslides, power outages, drinking water contamination
, and wildfires.
Is lapilli a volcanic hazard?
Lapilli is a size classification of tephra, which is material that
falls out of the air during a volcanic eruption
or during some meteorite impacts. … A pyroclastic particle greater than 64 mm in diameter is known as a volcanic bomb when molten, or a volcanic block when solid.
How would you know if the volcano is active and about to erupt?
An increase in the frequency and intensity of felt earthquakes
.
Noticeable steaming or fumarolic activity and new
or enlarged areas of hot ground. Subtle swelling of the ground surface. Small changes in heat flow.
What is the strongest volcanic eruption in the Philippines?
The Pinatubo eruption
is considered to be the most powerful volcanic eruption of the 20
th
century. Thankfully, it was also the eruption that the Philippines was most prepared for, thanks to the joint efforts of the PHIVOLCS and the United States Geological Survey.
What type of energy is derived from volcanoes?
Volcanoes are the main source of
geothermal energy
.
What is the biggest factor determining how a volcano will erupt?
Although there are several factors triggering a volcanic eruption, three predominate:
the buoyancy of the magma
, the pressure from the exsolved gases in the magma and the injection of a new batch of magma into an already filled magma chamber.
What are the 3 major types of magma?
There are three basic types of magma:
basaltic, andesitic, and rhyolitic
, each of which has a different mineral composition. All types of magma have a significant percentage of silicon dioxide. Basaltic magma is high in iron, magnesium, and calcium but low in potassium and sodium.
What's a dead volcano called?
A dormant volcano is one that is “sleeping” but could awaken in the future, such as Mount Rainier and Mount Fuji.
An extinct volcano
is “dead” — it hasn't erupted in the past 10,000 years and is not expected to ever erupt again.
What usually occurs in the volcano?
Bubbles of gas build up in the magma — which has a high silica content — and explode creating
volcanic ash
, consisting of tiny gritty sharp fragments of glassy snap-frozen magma and rock from the sides of the volcano vent.
