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The molten rock under a volcano, called magma, is under enormous pressure due to the amount of rock on top of it. In many cases there is gas trapped in the magma in a dissolved state. When the magma is exposed to the much lower pressure at or near the surface the gases come out of solution and form bubbles that expand very rapidly, creating an explosion that can pulverize the rock.
What else can I help you with?
The magma released from volcanoes is?
lava
Do volcanoes always produce lava flows?
No. Lava flow in a volcanic eruption is a factor of the temperature, chemistry, and amount of trapped gas in the lava. Highly viscous, felsic, gas charged magmas tend to explode upon eruption. Low viscosity, basaltic magmas tend to flow upon eruption.
What are the different types of volcanoes and describe?
There are many types of volcanoes, but these are the main ones: Composite/Strato- These are formed by alternating layers of lava and rock fragments. They are the large, colossal volcanoes that usually pop into your mind first when thinking of volcanoes. Mt. Hood and Mt. Rainier are examples of this. Shield- They are very large in size, but not normally very tall because the lava that comes out is very runny and doesn't pile up. This kind of lava is called basaltic lava. Mauna Loa in Hawaii (or Hawaii itself!) is a shield. Cinder cones- Are relatively small. They form in clusters around other volcanoes over vents. Paricutín in Mexico is a famous example that grew 300 feet in 5 days. Spatter cones- Formed quickly when the lava has enough gasses for it to explode. After it does so, they sink back into the ground soon afterward. Complex- Any volcano that consists of more than one vent (mostly all of them, technically)
What are vollcanos?
Volcanos are creators that explode with lava
What types of material can come out of volcanoes?
Volcanoes can release a variety of materials, including lava (molten rock), ash, steam, and gases such as sulfur dioxide and carbon dioxide. These materials can vary in composition and size depending on the type of volcanic eruption.
What are volanoes?
volcanoes are mountthat explode lava
Defention of extinct volcano?
the definition for volcanoes is when the lava gets to hot it will explode and cause a big destruption
Does a volcano have to explode?
No. While eruptions can be explosive, they often are not. Many volcanoes will pour out lava relatively gently.
Do volcanoes need lava to be known as actual volcanoes?
No, volcanoes do not need lava to be volcanoes.
Can lava make volcanoes?
NO, volcanoes make lava.
What type of explosion does a shield volcano have?
Generally shield volcanoes do not explode. They erupt in a non-explosive fashion, fountaining or oozing lava.
The magma released from volcanoes is?
lava
Do volcanoes always produce lava flows?
No. Lava flow in a volcanic eruption is a factor of the temperature, chemistry, and amount of trapped gas in the lava. Highly viscous, felsic, gas charged magmas tend to explode upon eruption. Low viscosity, basaltic magmas tend to flow upon eruption.
How do volcanoes shape the Pacific Northwest?
volcanoes will erupt and let out lava then the lava will harden and that will be new land.
What can volcanoes make?
lava
Are volcanoes full of lava?
no
What do volcanoes blow out?
Lava
