Volcanoes Flashcards
(26 cards)
Volcanoes can be mostly found in…
clusters and near tectonic plates
according to Geologists, how many volcanoes are active and inactive on Earth?
more than 100,000 active and inactive volcanoes.
Where are the most active volcanoes located?
The Alpine-Himalayan belt and the Circum-pacific belt
Which stands as a proof for the collision of the African and Indo-Australian plate and the southern margin of the Eurasian plate?
The Alpine-Himalayan belt.
This type of volcano has no history of eruptions but may erupt based on seismic indications of tectonic activity beneath the volcano. (activity)
dormant volcano
This type of volcano may erupt any time. (activity)
Active volcano
This type of volcano has no records of eruption and tectonic activity for a period of time.(activity)
extinct volcano.
A path that traces the boundaries between several tectonic plates around the pacific ocean.
Ring of fire / Circum-pacific belt
It contains about 75% of planet’s volcanoes.
Ring of fire / Circum-pacific belt
These kind of volcanoes are tall steep mountains.
stratovolcano
These kind of volcanoes have large depressions in the ground.
caldera
These kind of volcanoes have have flatter and dome shaped structure.
shield volcano
Underwater chains of volcanic mountains.
mid-ocean ridges
What is magma called when it escapes out of the volcano?
lava
Pyroclastic flow
It is when a volcano erupts w/ searing hot gas combined with ash formed in the mantle. This cam race down the sides of a volcano.
Used to measure and classify eruptions.
Volcanic Explosivity Index (VEI)
Who invented the VEI?
Scientists
True/False: The VEI scale starts with zero and ends or is limited to 8.
False. it starts w/ zero but has no upper limit.
VEI 8
Is recorded as the most catastrophic eruptions measured.
Which volcano erupted at a scale of VEI 7 and what is its kind?
Mt. Tambora, a stratovolcano but is now a caldera due to the eruption.
The Mid-Atlantic Ridge, Circum-pacific belt, Alpine-Himalayan belt are examples of?
Tectonically active areas
True/False: Volcanoes form due to collision of plate tectonics
True
Benefits of Ash from a volcanic eruption
provides nutrients to nearby soil, making the land fertile.
Benefits of lava
When cooled down it hardens to rock and creates new landforms
