The style of eruption depends on a number of factors, including the magma chemistry and content, temperature, viscosity (how runny the magma is) , volume and how much water and gas is in it, the presence of groundwater, and the plumbing of the volcano.
What are 3 local effects of volcanoes?
Volcanoes can change the weather. They can cause rain, thunder and lightning . Volcanoes can also have long-term effects on the climate, making the world cooler. Fast-moving lava can kill people and falling ash can make it hard for them to breathe.
What are the three factors that affect volcanic eruptions?
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 types of volcano according to its eruptive history?
There are three types of volcanoes: cinder cones (also called spatter cones), composite volcanoes (also called stratovolcanoes) , and shield volcanoes.
What are the three types of eruptive products that volcanoes expel?
Several types of volcanic eruptions—during which lava, tephra (ash, lapilli, volcanic bombs and volcanic blocks) , and assorted gases are expelled from a volcanic vent or fissure—have been distinguished by volcanologists. These are often named after famous volcanoes where that type of behavior has been observed.
What is volcano and its causes and effects?
Below the Earth's core there's a red-hot liquid rock called magma. A volcano is a rupture on the Earth's crust, which allows lava, ash, and gases to escape, when magma rises to the surface. ... Volcanoes can change the weather. They can cause rain, thunder and lightning . They can also have long-term effects on the climate.
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 are 3 positive effects of volcanoes?
There are many positive effects of volcanoes including: Fertile soils, tourism, geothermal energy, creation of new land and building materials . Volcanic soils are very fertile. These rich soils are called laterite soils and are rich in minerals.
What is usually a safe distance away from a volcano?
The safe distance from an active volcano is generally 5kms or more but you should check for the latest CDEM information. Beyond this distance the major hazards will be ashfall and volcanic gas.
How do volcanoes affect people's lives?
Fast-moving lava can kill people and falling ash can make it hard for them to breathe. They can also die from famine, fires and earthquakes which can be related to volcanoes. People can lose their possessions as volcanoes can destroy houses, roads and fields.
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.
Which type of volcano is the most explosive?
Because they form in a system of underground conduits, stratovolcanoes may blow out the sides of the cone as well as the summit crater. Stratovolcanoes are considered the most violent.
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 |
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What is a volcano that will not erupt?
Dormant volcanoes have not erupted for a very long time but may erupt at a future time. Extinct volcanoes are not expected to erupt in the future. Inside an active volcano is a chamber in which molten rock, called magma, collects.
What's a strombolian eruption?
Strombolian eruptions consist of ejection of incandescent cinders, lapilli, and lava bombs , to altitudes of tens to a few hundreds of metres. The eruptions are small to medium in volume, with sporadic violence. This type of eruption is named for the Italian volcano Stromboli.
Which volcano is the least explosive answer?
Shield volcanoes tend to be the least explosive volcanoes.
