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Crater Lake formed after the collapse of Mount Mazama.
A Caldera
It was formed by the collapse of the volcano Mount Mazama.
Caldera but this is normal associated with volcanoes
This is known as a Caldera.
Volcanic crater.
This is a crater
This is known as a caldera or a crater.
Crater Glacier formed in the crater left by the 1980 eruption of Mount St Helens. The glacier formed between the crater's south wall and the cooled lava dome in the middle. The high walls of the crater keep the southern part of the crater in almost perpetual shade. Without sunlight, this location remains cool and so the snow that falls there never completely melts. Over the course of a few years this snow has piled up to form a glacier.
A circular basin surrounded by mountains is typically referred to as a crater or caldera, depending on whether it was formed by volcanic activity or by the collapse of a volcanic cone.
Crater
a crater can be formed anywhere in a volcano. its usually formed at the top though.