Volcanoes are classified as
active, dormant, or extinct
. Active volcanoes have a recent history of eruptions; they are likely to erupt again. Dormant volcanoes have not erupted for a very long time but may erupt at a future time.
Why are volcanoes classified?
Volcanoes are classified by
the eruption type and by the volcanic cone shape
. There are three basic cone shapes and six eruption types. The three cone shapes are cinder cones, shield cones, and composite cones or stratovolcanoes.
What are the 3 classification of active volcano?
There are three types of volcanoes:
cinder cones (also called spatter cones), composite volcanoes (also called stratovolcanoes), and shield volcanoes
. Figure 11.22 illustrates the size and shape differences amongst these volcanoes. Shield volcanoes, which get their name from their broad rounded shape, are the largest.
What are the 7 types of volcano?
The result is the classic cone shape of composite volcanoes. A cross section of a composite volcano reveals alternating layers of rock and ash: (1) magma chamber, (2) bedrock, (3) pipe, (4) ash layers, (5) lava layers, (6) lava flow,
(7) vent, (8) lava, (9) ash cloud
.
What is the classification of volcanoes based on?
Two basic classifications of volcanoes are based upon the type of eruption they produce:
explosive (or central) and quiet (or fissure)
. Explosive eruptions are caused by the buildup of gasses under highly viscous (thick and slow-flowing) magma trapped deep within the volcano.
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 4 factors are used to classify volcanoes?
There is no easy answer to this question, as scientists classify volcanoes in several different ways, including
size, shape, explosivity, lava type, and tectonic occurrence
. Furthermore, these different classifications often correlate.
How do you classify an extinct volcano?
A dormant volcano is an active volcano that is not erupting, but supposed to erupt again. An extinct volcano
has not had an eruption for at least 10,000 years and is not expected to erupt again in a comparable time scale of the future
.
What is volcano short answer?
A volcano is
an opening in the earth's crust through which lava, volcanic ash, and gases escape
. … Beneath a volcano, liquid magma containing dissolved gases rises through cracks in the Earth's crust. As the magma rises, pressure decreases, allowing the gases to form bubbles.
What is the 22 active volcanoes in the Philippines?
| Item No. Name of Volcano Province | 19 Musuan (Calayo) Bukidnon in Mindanao | 20 Parker South Cotobato/General Santos/ North Cotabato/Sarangani Provinces in Mindanao | 21 Pinatubo Boundaries of Pampanga, Tarlac and Zambales in Luzon | 22 Ragang Lanao del Sur and Cotobato in Mindanao |
|---|
How many volcano types are there?
Geologists generally group volcanoes into
four main kinds–cinder cones
, composite volcanoes, shield volcanoes, and lava domes.
What are the 11 types of volcanoes?
- Cinder Cone Volcanoes: These are the simplest type of volcano. …
- Composite Volcanoes: Composite volcanoes, or stratovolcanoes make up some of the world's most memorable mountains: Mount Rainier, Mount Fuji, and Mount Cotopaxi, for example. …
- Shield Volcanoes: …
- Lava Domes:
What is the largest volcano type?
Mauna Kea and Mauna Loa are
shield volcanoes
. They are the world's largest active volcanoes, rising over 9 km above the sea floor around the island of Hawai'i.
What is flowing lava called?
When a volcano erupts, the molten rock (or
magma
) that comes out of the Earth is called lava. Because lava is so hot (more than 1,100 degrees C, over 2,000 degrees F), it remains molten and flows across the ground until it cools and hardens into rock.
Do all volcanoes erupt lava?
Scientists realized long ago that no two volcanoes
erupt
the same. Some, like Mount St. Helens, burst violently and send ash and gas high into the air. Others, like Kilauea in Hawaii, ooze red hot lava which runs like maple syrup down the slope of the volcano.
Which type of magma is the thinnest?
Pahoehoe
. Pronounced “pa-ho-ho,” this is a type of lava that is much thinner and a lot less gooey than the a'a type of lava. It often flows down the slopes of volcanoes located in very large rivers.
