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If the magma is rich in silica, the caldera is often filled in with ignimbrite, tuff, rhyolite, and other igneous rocks. Silica-rich magma does not flow like basalt due to having a high viscosity. As a result, gases tend to become trapped at high pressure within the magma. When the magma approaches the surface of the Earth, the gases decompress rapidly, causing explosive destruction of the magma and spreading volcanic ash over wide areas. Further lava flows may be erupted.
What else can I help you with?
Why do volcanoes sometimes get lower?
In an explosive eruption, the summit may be blasted away. In large eruptions, so much magma may be erupted that a volcano can collapse into the space left behind, leaving a caldera.
How many volcanoes are dangerous on earth?
I think any volcano is potentially dangerous. It was once thought that volcanoes were extinct but now scientist think volcanoes are active or dormant. So any volcanoe could erupt and be dangerous. Some are more likely to than others.
Are mud volcanoes dangerous?
Mud volcanoes can be dangerous due to the potential for sudden eruptions of mud, gas, and rocks. They can also emit toxic gases like methane and hydrogen sulfide, posing a risk to nearby communities. However, with proper monitoring and precautions, the risk can be minimized.
What are the 6 active volcanoes in California?
The six active volcanoes in California are Mount Shasta, Lassen Peak, Medicine Lake Volcano, Clear Lake Volcanic Field, Long Valley Caldera, and Salton Buttes. These volcanoes have had volcanic activity in the recent geological past and are monitored closely for any signs of potential eruptions.
Does Hungary have volcanoes?
No, Hungary does not have active volcanoes. The country is located in a region that is not seismically active, so there are no current volcanic eruptions occurring in Hungary.
Why do volcanoes get lower?
In an explosive eruption, the summit may be blasted away. In large eruptions, so much magma may be erupted that a volcano can collapse into the space left behind, leaving a caldera.
Why do volcanoes sometimes get lower?
In an explosive eruption, the summit may be blasted away. In large eruptions, so much magma may be erupted that a volcano can collapse into the space left behind, leaving a caldera.
Why do the volcanoes in Japan have explosive eruptions?
Volcanoes in Japan have explosive eruptions because there is a a magma chamber that has not completely move along the mantle yet so when it erupts it has explosive eruptions.
How many volcanoes are dangerous on earth?
I think any volcano is potentially dangerous. It was once thought that volcanoes were extinct but now scientist think volcanoes are active or dormant. So any volcanoe could erupt and be dangerous. Some are more likely to than others.
Are mud volcanoes dangerous?
Mud volcanoes can be dangerous due to the potential for sudden eruptions of mud, gas, and rocks. They can also emit toxic gases like methane and hydrogen sulfide, posing a risk to nearby communities. However, with proper monitoring and precautions, the risk can be minimized.
Why are Caldera's eruptions so dangerous?
Calderas form as a result of extremely large volcanic eruptions. Caldera-forming eruptions produce huge amounts of ash and pumice. Ash pumped into the upper atmosphere can travel many miles, and areas around the volcano may be buried. Areas closer to the volcano will be struck by massive pyroclastic flows, burning hot clouds of ash that move along the ground at high speeds. Some of these eruptions release so much sulfur that it affects the climate, creating abnormally cool conditions that can lead to crop failures around the world.
What are the 6 active volcanoes in California?
The six active volcanoes in California are Mount Shasta, Lassen Peak, Medicine Lake Volcano, Clear Lake Volcanic Field, Long Valley Caldera, and Salton Buttes. These volcanoes have had volcanic activity in the recent geological past and are monitored closely for any signs of potential eruptions.
Does Hungary have volcanoes?
No, Hungary does not have active volcanoes. The country is located in a region that is not seismically active, so there are no current volcanic eruptions occurring in Hungary.
What country has so many volcanoes they hold regular volcano drills?
I think its Hawaii because that probably had the most eruptions.
How else can volcanoes form lakes?
Volcanoes are formed when cracks and fissures in the earth's surface allow molten rock, ash and gasses to escape from deep within the earth. When these eruptions happen the material cools above the earth's surface. Over many eruptions this can cause the volcano to form a mountain shape.
All volcanoes whether active or inactive are dangerous do you think this is true?
With some exceptions, volcanoes are generally not dangerous to people. Your chance of being killed by a volcano is 1 in 80000 over your lifetime, which is far less than your chance of being killed in say a motor vehicle accident (1 in 67). There are also two classifications for inactive volcano's. Volcanoes which have not erupted for a significant amount of time are known as dormant volcanoes. Volcanoes which have not erupted in human history are known as extinct volcanoes. Extinct volcanoes are never expected to erupt again, and are therefore not dangerous unless they have been misclassified. So no, I do not think that all volcanoes whether active or inactive are dangerous. The only dangerous volcanoes are dormant volcanoes that explode suddenly with little or no warning.
Is mount novarupta composite volcano?
No. It is just a caldera and a lava dome, so there is no Mount in Novarupta. It is a very young volcano at this point, just over 100 years old. If it becomes active again, future eruptions may build it into a composite volcano.
