What are volcanoes?
A volcano is a mountain that opens downward to a pool of molten rock below the surface of the earth. When pressure builds up, eruptions occur. In another definition it is a mountain
That has a passage to the underground molten seas of rocks , when the pressure increases on this molten seas it causes eruption gases and molten rocks shoot up through a hole in the top of the mountain and fill the air with lava fragments .
This eruptions cause a leatral blasts ,lava flows , hot ash flows and many other disaster .
Some eruptions can knock down enter forests and cause trigger tsunami and earth quakes.
Comes out of volcanoes when its eruption Regolith solid and molten material (lava) and gases.
Rock debris: emerges as a result
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If the cone is made up entirely of rock debris, we found very high gradient for the space occupied by the base. Here we find the gradient of 30 degrees and sometimes up to 40 degrees Celsius and these forms usually arise as a result of volcanic eruptions and represented in the islands in Indonesia.
Volcanic plateau: volcanic plateau or "shielded" as a result of outflows lava and accumulation on the main nozzle and the low-rise look for the large area occupied by the rules. And look peaks like convex plateaus with convexity weak and from this it renamed volcanoes Plateau These cones originated from the flow of molten severe lava heat and great liquidity, which has spread over large areas and is this volcanic plateau best representation in the volcanoes of the Hawaiian volcano Mauna Loa Islands, which has a height of 4100 m, which seems more like a spacious dome descend steeper easy and fragile.
Volcanoes class: class volcanoes common type of existence, which is formed in the center of the former types and its cones composed of rock debris material and lava flows directed by the volcano eruption, while restless. And the outcomes be coming out of the volcano eruptions during successive layers on each other, and some of them consisting of coarse material and another section of accurate materials, and between this and that interfere lava in a few strips of fish
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The number of ancient extinct volcanoes for the tens of thousands; where there are volcanic rocks in most regions of the earth, and the significance of the volcanoes in the following:
Knowledge of the internal structure section of the earth's crust and the outer part of the Earth's atmosphere; because the lava issued from this level, a depth of about 450 kilometers.
Indicate the pressure sites in the earth's crust; the volcanic sites consistent with the pressure sites in the cortex where there are significant cracks and deep. It is not difficult to see volcanoes flustered imagine the devastation and destruction caused by the lava if it hit the urban areas. The effects are not limited
Volcanoes only volcano area, but may go beyond it to a nearby or even very remote
Miesse, Willian C. "Mount Shasta Geology and History." USGS: Volcano Hazards Program - Mount Shasta Geology and History. College of the Siskiyous Library, n.d. Web. 01 May 2014.
Wood and Kienle, 1990, Volcanoes of North America: United States and Canada: Cambridge University Press, 354 p., p. 158-160, Contribution by Patrick Pringle.
Tarbuck E., Lutgens F., Tasa D., 2014, An Introduction to Physical Geology, 5th Ed, Pearson Education, Upper Saddle River, New Jersey.
...e than 30 volcanoes that have erupted over the past 300,000 years in the Lassen Peak volcanic area.
Basalt forms due to the partial melting of the layer of the mantle called the asthenosphere. The asthenosphere is the plastic zone of the mantle beneath the rigid lithosphere. Mantle plumes coming from the mesosphere can cause the asthenosphere to melt with heat or even if pressure decreases, which is called decompression melting (Richard 2011). The magma that forms from this melting is mafic magma that solidifies once it reaches the earth’s surface and cools quickly. The above process mainly occurs mainly during intraplate igneous activity which is the main explanation for volcanic activity that occurs a long distance away from a plate boundary. If the tectonic plate above the mantle plume is moving it can create a string of volcanic activity such as in Hawaii. See Fig 2.
Stories about volcanoes are captivating. Myths come in different versions, but all of them are capable of capturing yours, and everybody’s imagination.
The Mauna Loa volcano is located in Hawaii and means "Long Mountain" in Hawaiian. It is a giant, basaltic shield volcano. It is one of the largest volcanoes and mountains in the world and has been called the "monarch of mountains". It has an estimated volume of 9,600 cubic miles and takes up half the land of Hawaii. It extends about 120 km starting from the southern tip of the island to the northern region. It is 97 km (60 miles) long, 48 km (30 miles) wide, and is 8,742 km (28,680 miles) high from the base on the sea floor to the top. The slopes are steeper than 12 degrees and about 4 degrees at the top of the volcano. Mauna Loa formed about half a million years ago and in the middle stages of forming into a shield volcano where lava flows to form a sloped and broad flat domed volcanic cone. Along with Mauna Kea, the Mauna Loa volcano is responsible for the creation of the Hawaiian Islands. Mauna Loa has erupted thirty-three times since 1843 and is known as one of the most active volcanoes in the world today. The last eruption was 1984 and lava flowed within 4 miles of the city of Hilo. This shows that it is dangerous to live anywhere near Mauna Loa and that it poses as a threat to anyone living near it because it has a very high possibility of erupting within a very short span of time. Below is a picture of Mauna Loa taken from a bird's eye view.
Magma is a hot liquid made of melted minerals. Minerals can form crystals when they are cool. Igneous rock can form underground, where the magma cools. slowly. Or, igneous rock can form above ground, where the magma cools.
Volcanoes can be one of the most destructive forces on Earth. It is estimated that some
A volcano is the product when magma, gases, and rock fragments from underground are pushed up from the mantle. When volcanoes erupt, they expel granitic and andesitic materials that have been building up through the crust, creating an explosion of lava and ash. Volcanic landforms are formed from tectonic plates, that move and alter the lands and oceans on Earth. Located around the Pacific Plate is a chain of volcanoes, one of which is called Cotopaxi.
Magma is molten rock or in other words, melted rock that bubbles to the surface where there are weaknesses in the crust of the Earth. Volcanologists need to how magma can affect the world outside but also how it’s formed inside Earth to better understand volcanoes. sampling Most of a volcanologists’ work is in the lab or in their office. But on the occasion that they do go to a live volcano, good sample taking of the
The island in which the volcano is located in is still accessible by the public and is an attraction for tourists. The volcano’s absolute location is 31.5833° N, 130.6500° E. The country itself rests on the Eurasian Plate, coming in contact with the Filipino plate.
A volcano is a mountain or hill built up around a vent that connects to a reservoir of molten rock from beneath the surface of the Earth. The molten rock is lighter than the surrounding hard rock and will eventually break through a weak point in the Earth’s crust. When this happens the volcano may have a violent eruption of gas, rocks, molten lava, and ash. Volcanoes are generally grouped into four categories: cinder cone, composite volcanoes, shield volcanoes, and lava domes.
Mount Vesuvius is a volcano located in southern Italy, near the bay of Naples and the city of Naples. It is the only active volcano on the European mainland. Vesuvius rises to a height of 1277 m (4190 ft). Vesuvio (Vesuvius) is probably the most famous volcano on earth, and is one of the most dangerous.