Most volcanoes are found near spreading and colliding boundaries.
The largest volcanic calderas in the world are found in Indonesia, including Toba Caldera in Sumatra and Tambora Caldera in Sumbawa. These calderas were formed by massive volcanic eruptions and are some of the largest and most well-known calderas on Earth.
There are a few ancient Calderas in Texas. Texas isn't near any 'hotspots' or tectonic plate boundaries, so it's not volcanically active. The Calderas are in the western part of the state and are about 40 million years old or so... One in particular is the Buckhorn Caldera near Ft. Davis, Texas.
No. Hot spots are located under many, but not most volcanoes. Many calderas are associated with subduction zones. When the ground in a caldera rises it is called a resurgent dome, not a hot spot.
When rock melts at calderas, it forms magma. This magma is then forced towards the Earth's crust as lava through volcanic eruptions.
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Nigeria has no calderas.
Calderas can be found in volcanic regions where large volcanic eruptions have resulted in the collapse of the magma chamber underneath the volcano. Some well-known calderas can be found in places like Yellowstone National Park in the United States and Santorini in Greece.
Calderas can be occupied by lakes, but they do not have to be. Seomve calderas are dry while others are located beneath the sea.
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Yellowstone National Park in Wyoming contains a huge caldera.
The largest volcanic calderas in the world are found in Indonesia, including Toba Caldera in Sumatra and Tambora Caldera in Sumbawa. These calderas were formed by massive volcanic eruptions and are some of the largest and most well-known calderas on Earth.
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Yellowstone National Park.
There are a few ancient Calderas in Texas. Texas isn't near any 'hotspots' or tectonic plate boundaries, so it's not volcanically active. The Calderas are in the western part of the state and are about 40 million years old or so... One in particular is the Buckhorn Caldera near Ft. Davis, Texas.
Calderas are typically larger than most impact craters, which are formed by meteorite impacts. Calderas are massive volcanic depressions that form when the ground collapses after a volcanic eruption depletes the magma chamber. The size of both structures can vary greatly, but calderas tend to be larger in scale.