Crash Course
What Are Rocks and How Do They Form? Crash Course Geography
From towering mountains to pebbles along a river, the Earth is made of a huge variety of rocks. In today's episode, we're going to follow the rock cycle of a piece of granite in the Himalayan mountains, and as you'll see, every rock has...
Professor Dave Explains
Classification of Igneous Rocks: Intrusive vs. Extrusive
Now that we know how igneous rocks form, what are the types of igneous rocks? This depends on precisely where they form, and we can call them either intrusive or extrusive. These can also be called either plutonic or volcanic. What do...
Professor Dave Explains
An Overview of Earth’s Layers
We only interact with the very surface of the Earth, called the crust. So what else is down there? What is the composition of the Earth? How many layers are there, and how do they differ? What is the mantle, and how does it convect? What...
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Chunks of rock fall off cliff into boiling lava lake, Marum Volcano, Ambrym Island, Vanuatu
Chunks of rock fall off cliff into boiling lava lake, Marum Volcano, Ambrym Island, Vanuatu
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Toxic volcanic gases stream from the edge of giant crater, Marum Volcano, Ambrym Island, Vanuatu
Toxic volcanic gases stream from the edge of giant crater, Marum Volcano, Ambrym Island, Vanuatu
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Wide shot of Marum volcano's lava lake releasing toxic gases, Marum Volcano, Ambrym Island, Vanuatu
Wide shot of Marum volcano's lava lake releasing toxic gases, Marum Volcano, Ambrym Island, Vanuatu
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Toxic gases swirl over volcanic landscape, Marum Volcano, Ambrym Island, Vanuatu
Toxic gases swirl over volcanic landscape, Marum Volcano, Ambrym Island, Vanuatu
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Toxic volcanic gases blow off the edge of crater, Marum Volcano, Ambrym Island, Vanuatu
Toxic volcanic gases blow off the edge of crater, Marum Volcano, Ambrym Island, Vanuatu
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Toxic volcanic gases blow off the edge of crater, Marum Volcano, Ambrym Island, Vanuatu
Toxic volcanic gases blow off the edge of crater, Marum Volcano, Ambrym Island, Vanuatu
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Clouds of volcanic gas rise from giant crater at Marum volcano, Ambrym Island, Vanuatu
Clouds of volcanic gas rise from giant crater at Marum volcano, Ambrym Island, Vanuatu
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Men stand on edge of giant crater at Marum volcano, Ambrym Island, Vanuatu
Men stand on edge of giant crater at Marum volcano, Ambrym Island, Vanuatu
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Climbers prepares to descend into active volcano and lava lake, Marum Volcano, Ambrym Island, Vanuatu
Climbers prepares to descend into active volcano and lava lake, Marum Volcano, Ambrym Island, Vanuatu
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Climber admires spectacular volcanic eruption of lava, Marum Volcano, Ambrym Island, Vanuatu
Climber admires spectacular volcanic eruption of lava, Marum Volcano, Ambrym Island, Vanuatu
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Lava lake surges dramatically at night, Marum Volcano, Ambrym Island, Vanuatu
Lava lake surges dramatically at night, Marum Volcano, Ambrym Island, Vanuatu
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Volcano erupts very close to scientist, Marum Volcano, Ambrym Island, Vanuatu
Volcano erupts very close to scientist, Marum Volcano, Ambrym Island, Vanuatu
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Lava lake erupts violently at dusk inside active volcano, Marum Volcano, Ambrym Island, Vanuatu
Lava lake erupts violently at dusk inside active volcano, Marum Volcano, Ambrym Island, Vanuatu
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Close up waves of lava flowing against cliff, Marum Volcano, Ambrym Island, Vanuatu
Close up waves of lava flowing against cliff, Marum Volcano, Ambrym Island, Vanuatu
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Close up of lava boiling vigorously in volcanic crater, Marum Volcano, Ambrym Island, Vanuatu
Close up of lava boiling vigorously in volcanic crater, Marum Volcano, Ambrym Island, Vanuatu
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Volcanic gas streams from lava lake at night, Marum Volcano, Ambrym Island, Vanuatu
Volcanic gas streams from lava lake at night, Marum Volcano, Ambrym Island, Vanuatu
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Medium shot of lava lake erupting violently, Marum Volcano, Ambrym Island, Vanuatu
Medium shot of lava lake erupting violently, Marum Volcano, Ambrym Island, Vanuatu
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Climber stands on ledge above dangerously erupting lava, Marum Volcano, Ambrym Island, Vanuatu
Climber stands on ledge above dangerously erupting lava, Marum Volcano, Ambrym Island, Vanuatu
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Climber prepares to descend into active volcano and lava lake, Marum Volcano, Ambrym Island, Vanuatu
Climber prepares to descend into active volcano and lava lake, Marum Volcano, Ambrym Island, Vanuatu
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Close up shot of sloshing lava lake at Marum volcano, Ambrym Island, Vanuatu
Close up shot of sloshing lava lake at Marum volcano, Ambrym Island, Vanuatu
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Climber prepares to descend into active volcano and lava lake, Marum Volcano, Ambrym Island, Vanuatu
Climber prepares to descend into active volcano and lava lake, Marum Volcano, Ambrym Island, Vanuatu