This is my movie. Hope you enjoy!
Wednesday, June 30, 2010
Friday, June 11, 2010
What are Volcanoes?
Volcanoes are coned shaped and erupts lava. They are mostly found on the edge of the Tectonic plates. Volcanoes are found in Hot Spots. It also erupts hot ashes, Rocks, Steam and lava. Most Volcanoes are found underwater. They can cause Tsunami's.
How are they formed?
The magma builds up the magma chamber below the vent. It creates enough pressure for the magma to erupt. As it releases it causes clouds of ash and fountains of lava to explode. Then the lava turns into molten rock.
How does an eruption occur?
An eruption occurs when the heat pressures the magma to come out of the vent. High pressure causes the magma to be gooey, sticky and thick. That is how an eruption occurs.
Types of Volcanoes
There are 3 types of volcanoes. One of them is the Cinder Cone Volcano. When a Cinder Cone Volcano erupts it flows in fiery clouds of ash. This volcano is very explosive. It is coned shaped and it has steep sides. The pieces of this volcano flows as high as the sky. There are varying sizes. Some are as fine as the sand and some are the sizes of houses.
Another one is Shield Volcano. Shield Volcanoes have shallow shield mounds. This volcano got its name because it is shaped like an ancient warriors shield. This volcano has flat bottomed craters.
The biggest Volcano?
The biggest volcano round the world is Mauna Loa. Its name means long mountain. It is one of the most active volcanoes on earth. Mauna Loa last erupted in 1984.
Mauna Loa is one of the largest volcanoes on earth. It is so big that its slopes cover a large part of Hawaii. It also is 4170m above sea level. This is one of the volcanoes which is a largest of a chains of islands.
Volcanoes are cool to learn about because there are many around us. We have 48 volcanoes around us and they are very fascinating.