How Geysers and Hot Springs Work
Geysers and hot springs form where groundwater is heated by volcanic activity close to the surface; only a rare few develop the underground plumbing needed to erupt on a cycle.
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The Main Types of Volcanoes
Volcanoes take on several distinct shapes depending on how fluid their magma is and how violently it erupts, from broad shield volcanoes to steep stratovolcanoes, small cinder cones, and collapsed calderas.
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Volcanic Islands vs Continental Islands
Islands form in two fundamentally different ways: volcanic islands are built from erupted material above hot spots or subduction zones, while continental islands are simply fragments of continental crust left isolated by rifting or rising sea levels.
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