There's a lot of pressure, the weight of the overlying rock bearing down ... that are brought to the surface by a very deep-seated volcanic eruption. It's a very special kind of eruption, thought ...

Sometimes eruptions are explosive and lava is thrown out as volcanic bombs. Hotspots are places where the magma rises up through the crust. They are caused by a static source of magma, often away ...

It's a win-win, and it's why everything on iStock is only available royalty-free — including all 4K Resolution images and footage. What kinds of royalty-free files are available on iStock? How can you ...

It's a win-win, and it's why everything on iStock is only available royalty-free — including all 4K Resolution images and footage. What kinds of royalty-free files are available on iStock? How can you ...

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