What is a volcano? 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. Gases and rock shoot up through the opening and spill over or fill the air with lava fragments. Eruptions can cause lateral blasts, lava flows, hot ash flows, mudslides, avalanches, falling ash and floods. Volcano eruptions have been known to knock down entire forests.
An erupting volcano can trigger tsunamis, flash floods, earthquakes, mudflows and rockfalls. How are volcanoes formed? Volcanoes are formed when magma from within the Earth's upper mantle works its way to the surface.
Indonesia earthquake: Nearly 100 dead, hundreds more injured as quake strikes Sumatra - TomoNews
At the surface, it erupts to form lava flows and ash deposits. Over time as the volcano continues to erupt, it will get bigger and bigger.
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What are the different stages of volcanoes? Scientists have categorized volcanoes into three main categories: An active volcano is one which has recently erupted Essay On Earthquake In Indonesia there is a possibility that it may erupt soon. A dormant volcano is one which has not erupted in a long time but there is a possibility it can erupt in the future. Why do volcanoes erupt? The Earth's crust is made up of huge slabs called plates, which fit together like a jigsaw puzzle.
These plates sometimes move.
The friction causes earthquakes and volcanic eruptions near the edges of the plates. The theory that explains this process is called plate tectonics. What are plate tectonics? The theory of plate tectonics is a interesting story of continents drifting from place to place breaking apart, colliding, and grinding against each other.
The plate tectonic theory is supported by a wide range of evidence that considers the earth's crust and upper mantle to be composed of several large, thin, relatively rigid plates that move relative to one another. The plates are all moving in different directions and at different speeds.
Disclaimer: This essay has been submitted by a student. This is not an example of the work written by our professional essay writers. Any opinions, findings. Ancient history. Zakynthos has been inhabited from at least the Paelolithic and later Neolithic Age as some archaeological excavations have proven. The island was. Volcanoes (Volcanoes are not associated with weather, but instead are natural disasters.) What is a volcano? A volcano is a mountain that opens downward to a pool. The Fukushima Daiichi nuclear disaster (福島第一原子力発電所事故, Fukushima Dai-ichi (pronunciation) genshiryoku hatsudensho jiko) was an energy accident.
Sometimes the plates crash together, pull apart or sideswipe each other. When this happens, it commonly results in earthquakes. To see this animation again, just refresh this page!
We provide excellent essay writing service 24/7. Enjoy proficient essay writing and custom writing services provided by professional academic writers. Meanwhile in Padang, Indonesia, students climb out of the rubble of a collapsed building after the first earthquake struck the archipelago yesterday. Feb 06, · How to Prepare for an Earthquake. An earthquake can be a very destructive natural disaster, particularly in the Pacific Rim region. After an earthquake. ADVERTISEMENTS: Here is your comprehensive essay on Natural Disasters! Nature and Management: A natural disaster is unforeseen, severe and . A huge undersea earthquake has struck off the coast of Bali, Indonesia, just days before families are expected to flock to the holiday destination for the school break.
This animation shows you what our planet looked like millions of years ago and what it looks like now! Geology Department at University of California, Berkeley. Cinder cones are circular or oval cones made up of small source of lava from a single vent that have been blown into the air, cooled and fallen around the vent.
Composite volcanoes are steep-sided volcanoes composed of many layers of volcanic rocks, usually made from high-viscosity lava, ash and rock debris. Rainier and Mount St. Helens are examples of this type of volcano. Shield volcanoes are volcanoes shaped like a bowl or shield in the middle with long gentle slopes made by basaltic lava flows.
Basalt lava flows from these volcanoes are called flood basalts. The volcanoes that formed the basalt of the Columbia Plateau were shield volcanoes. Lava domes are formed when erupting lava is too thick to flow and makes a steep-sided mound as the lava piles up near the volcanic vent.
The eruption of Mount St.
Helens in was caused in part by a lava dome shifting to allow explosive gas and steam to escape from inside the mountain.