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When oceanic crust and the continental crust come together, or converge. Do to density, the oceanic plate sinks beneath the less dese continental plate. This process, called subduction, occurs. Because of how thin the oceanic crust is the lava from the mantle can often come to the surface creating volcanos.🌋

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What happens in these bounderies when oceanic and continental plates collide? That’s our topic today.

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The Barren Island volcano, India's only active volcano erupted recently. The eruption made news and caused scientists to sit up and take notice, making this a good time for us to find out more about volcanoes.
What's a volcano?
A volcano is a cone shaped mountain or a hill with a vent or opening at its peak. Through this, melted rock, ash and dust are thrown out when the volcano erupts.

But why does a volcano erupt? Well, rock deep beneath the Earth sometimes melts, and when it does, it becomes lighter than the solid rock around it. Stuff that's lighter or less dense (that's the scientific word!) wants to rise always. So this melted rock starts climbing up looking for ways to reach the surface. And when it does find a vent, a volcanic explosion happens.

Sometimes when you get angry, but keep quiet about it, the anger starts to build up inside you. It builds and builds until you can hold it
no longer and simply explode angrily. That's how the volcano operates too.
Where are all the volcanoes?
Look at the picture below. You can see that the continents are broken up into pieces like a jigsaw puzzle. Those are the borders between plates. As you may know, the surface of the Earth is broken up into massive pieces called plates. The meeting point of two plates makes a boundary.

The red dots are volcanoes. As you can see the most seem to occur along plate boundaries.
Where is the world's biggest volcano?
Mauna Loa in Hawaii (part of the United States) is generally believed to be the answer. But in 2013, a gigantic undersea volcano was discovered in the Pacific Ocean east of Japan which is now recognized as the most massive volcano on Earth. Named Tamu Massif, this volcano is as large the Britain! Its top lies about 2000 metres below the ocean's surface.
Famous volcanic eruptions
Among the most famous was the eruption of Mount Vesuvius in Italy in the year 79. The disaster, which released energy equal to 100,000 big bombs, wiped out the town of Pompei. Vesuvius is an active volcano and although it hasn't erupted since 1944, there is every chance it will in the future.

More recently, the volcano Eyjafjallajökull in Iceland erupted in 2010, and the ash cloud that was released disturbed flights in Europe for almost a week.
Volcanoes and life
With all that sound and fury, and ash and dust, you would associate volcanoes with death, not life, right? Wrong! The warmth, minerals and the bacteria found in the sea around an active volcano actually seems to attract small creatures like shrimp, crabs and some kinds of worms!

In one astonishing incident, scientists even found a less-seen species of shark called the Pacific Sleeper Shark swimming around the mouth of an extremely active volcano in the Pacific Ocean.
Islands born of fire
Volcanic eruptions have also created one of the most unusual and wildlife rich habitats on Earth. Take the islands of the Galapagos which are situated close to the Equator off the coast of South America in an area of high volcanic activity.

The islands were formed from materials generated by volcanic eruptions and their distance from land meant that animals here evolved (developed) differently from anywhere else on the planet. As a result, we have unique animals here such as the Galapagos Giant Tortoise, Marine Iguana (the world's only sea-going lizard) and the Waved Albatross.

In fact the unique development of animals here in response to the environment inspired Charles Darwin to come up with his famous theory of evolution.

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The Barren Island volcano, India's only active volcano erupted recently. The eruption made news and caused scientists to sit up and take notice, making this a good time for us to find out more about volcanoes. What's a volcano? A volcano is a cone shaped mountain or a hill with a vent or opening at its peak.

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These currents work by material getting heated up, and due to this expanding making their volume increase. Due to the volume increase the density decreases making the material rise. While this is happening the air at the top is cooling and going back to normal size. Making the density go back to normal, so it sinks to the bottom. This is a constant cycle.

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Due to this constant cycle the tectonic plates start to move gradually.

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https://www.ck12.org/earth-science/ocean-continent-convergent-plate-boundaries/lesson/Ocean-Continent-Convergent-Plate-Boundaries-HS-ES/

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As you can see, one of the plates is going under the other because it has more density than the other plate. Then the more friction there is from the movement of the plates the more thermal energy there is. The thermal energy causes there to be heat which melts the other plate that didn’t fall down. What melted from the plate turns out to be magma/lava. So all in all, the plates together have formed a volcano 🌋

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Causing things like convergent boundaries where oceanic and continental crust meet, and due to this volcanos, and mountains are created

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https://www.ck12.org/earth-science/ocean-continent-convergent-plate-boundaries/lesson/Ocean-Continent-Convergent-Plate-Boundaries-HS-ES/

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Basically the plates push each other down and make a trench. The plates cause pressure that sends lava to fill the trench

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What would happen if three plates ever ran into each other, what type of boundary would it be; would it ever be possible?Also do you think it’s ever happened?

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This is an example of a convergent oceanic boundary. The tectonic plates have pushed each other under and the magma beneath has filled it.

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As said above a subduction is formed at a convergent plate boundary. At least one of them have to be a oceanic plate.

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Google Images

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Have you ever thought about what would happen if one of the plates ends up moving 3 inches per year and the other move 1 inches per year? What would happen to the earth

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https://geology.com/nsta/convergent-plate-boundaries.shtml