Ever wondered why some volcanoes explode violently whilst others just...
Geography129 views·Updated 27 Jun 2026·2 pagesWhat are the Different Types of Volcanoes?
Bethany Cook@bethanycook_ocxl
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Types of Volcanoes: Shield vs Composite
Shield volcanoes are the gentle giants of the volcanic world. They've got slopes less than 10 degrees - imagine a warrior's shield lying flat on the ground. These volcanoes are made entirely of basaltic lava that's really hot and flows easily because it's low in silica.
The key thing about shield volcanoes is that they're not dramatic at all. The low viscosity magma flows smoothly down the gentle slopes, building up the volcano bit by bit. You won't find much explosive material here - eruptions are quiet, frequent, and produce loads of fluid lava through fissure eruptions on the sides.
Composite volcanoes (also called strato-volcanoes) are completely different beasts. They're tall, steep-sided cones made of alternating layers of lava and ash - like a geological layer cake. The magma here is andesitic with medium viscosity, so it doesn't flow far from the base.
Quick Tip: Remember that composite volcanoes are found at convergent margins where oceanic crust gets pushed under continental crust - think Mt. St. Helens!
These volcanoes are proper explosive. Higher gas content means pyroclastic flows and much more dangerous eruptions that can last ages.
2
of 2
A shi](/_next/image?url=https%3A%2F%2Fcontent-eu-central-1.knowunity.com%2FCONTENT%2FuqvatLmRbNAzSSULafkx_image_page_2.webp&w=2048&q=75)
Volcanic Eruptions and Calderas
When volcanoes go completely mental, they can form calderas - massive circular craters up to 20km wide. This happens in three dramatic stages: violent eruptions empty the magma chamber, the top starts collapsing into the weakened space below, then the entire cone collapses. If it's near the coast, this can trigger tsunamis.
Volcanic eruptions happen when magma (molten rock from the Earth's mantle) rises to the surface because it's less dense than surrounding rock. As it rises, gas bubbles form inside it, and it searches for weak spots in the Earth's crust to break through.
Here's where it gets interesting: low viscosity magma flows out calmly as lava. But thick, high viscosity magma traps those gas bubbles, building up massive pressure until - BOOM! - you get an explosive eruption.
Remember: Viscosity is everything! Thick magma = explosive eruptions with pyroclastic flows, ash clouds, and volcanic bombs. Thin magma = gentle lava flows.
The nastiest eruptions produce pyroclastic flows (fast-moving clouds of hot ash and gas), ash clouds that travel for kilometres, and volcanic bombs - basically massive chunks of hot rock flying through the air.
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Geography129 views·Updated 27 Jun 2026·2 pagesWhat are the Different Types of Volcanoes?
Bethany Cook@bethanycook_ocxl
Ever wondered why some volcanoes explode violently whilst others just quietly ooze lava? Understanding the different types of volcanoes and how they work is crucial for your geography studies - and it's actually quite fascinating once you get the hang...
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Types of Volcanoes: Shield vs Composite
Shield volcanoes are the gentle giants of the volcanic world. They've got slopes less than 10 degrees - imagine a warrior's shield lying flat on the ground. These volcanoes are made entirely of basaltic lava that's really hot and flows easily because it's low in silica.
The key thing about shield volcanoes is that they're not dramatic at all. The low viscosity magma flows smoothly down the gentle slopes, building up the volcano bit by bit. You won't find much explosive material here - eruptions are quiet, frequent, and produce loads of fluid lava through fissure eruptions on the sides.
Composite volcanoes (also called strato-volcanoes) are completely different beasts. They're tall, steep-sided cones made of alternating layers of lava and ash - like a geological layer cake. The magma here is andesitic with medium viscosity, so it doesn't flow far from the base.
Quick Tip: Remember that composite volcanoes are found at convergent margins where oceanic crust gets pushed under continental crust - think Mt. St. Helens!
These volcanoes are proper explosive. Higher gas content means pyroclastic flows and much more dangerous eruptions that can last ages.
2
of 2Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Volcanic Eruptions and Calderas
When volcanoes go completely mental, they can form calderas - massive circular craters up to 20km wide. This happens in three dramatic stages: violent eruptions empty the magma chamber, the top starts collapsing into the weakened space below, then the entire cone collapses. If it's near the coast, this can trigger tsunamis.
Volcanic eruptions happen when magma (molten rock from the Earth's mantle) rises to the surface because it's less dense than surrounding rock. As it rises, gas bubbles form inside it, and it searches for weak spots in the Earth's crust to break through.
Here's where it gets interesting: low viscosity magma flows out calmly as lava. But thick, high viscosity magma traps those gas bubbles, building up massive pressure until - BOOM! - you get an explosive eruption.
Remember: Viscosity is everything! Thick magma = explosive eruptions with pyroclastic flows, ash clouds, and volcanic bombs. Thin magma = gentle lava flows.
The nastiest eruptions produce pyroclastic flows (fast-moving clouds of hot ash and gas), ash clouds that travel for kilometres, and volcanic bombs - basically massive chunks of hot rock flying through the air.
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