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__ VOLCANOS __ media type="custom" key="10059231" Charlie Ingham L4C Lloyd Street primary school Deadly heat & poisonous gas, it’s beautiful. What is it? A volcano there are three types of volcanos including the shield, composite and cylinder cone. Volcanos impact on wildlife, landscape, trees, homes and most importantly humans. Volcanic eruptions occur when pressure with the gas becomes too powerful. Over time magma gets collected up into the magma chamber because it is lighter than the surrounding rock it rises towards the surface. As the magma rises more gas builds up and water becomes steam. This increases the pressure in the chamber. When the pressure becomes too big there will be a volcanic eruption. They can range from gentle oozing to violent explosions. While the magma rises though the crater pipe bubbles of gas begin to form. When magma is super deadly with heaps of gas the eruption will be violent. This happens because the gas finds it hard to get away from the sticky magma then lots and lots of viscous magma and heaps of gas will create a violent explosion. When magma touches the surface it is known as lava. Volcanic eruptions are less intense when the magma is less viscous the gas escapes easier and quicker which makes it less intense. The three different volcanos are composite, cylinder cone and the shield volcanos. Cylinder cone can reach up to 250 meters in height and 500 meters in diameter. They appear in groups often near shield and composite volcanos. the composite volcano, also known as the stavatvolcano they are formed by lava and rock fragments that create mountain. The shield occurring at hot spots these are the largest volcanos erupting every few years all Hawaiian volcanos are shield volcanos. The day of Mount ST. Helens that gave huge impact on all living things. In 1980 on the morning of the 18 of may Mount ST Helens in the USA had erupted. The massive eruption lasted for 9 hours and ended up killing 57 people. It caused extensive damage to the surrounding wildlife and landscape. The blast was heard from about 300 kilometres away and there was a monstrous ash cloud that had ended up travelling 1 500 kilometres around the USA. The number of trees blown down could have built a whopping 300 000 homes.