how do earthquakes happen? - interactive whiteboards in the classroom

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Anyone who has seen the map of the world has noticed that certain parts of the continent seem to be grouped together like puzzles.
Scientists in their 1800 s have also begun to record all kinds of fossils that exist in different parts of the world, thousands of miles apart, and there is no obvious way to cross the ocean.
In order to explain the geographical similarity of the continent and the fossil remains of the oceans, Alfred wegenna published The Origin of the continent and the oceans in 1912.
In his research, he believed that the continent had once been connected to a vast land, which he called the Pan-continent, and that for thousands of years they had "alienated" to their present position.
However, Wegener has no scientific evidence of how this happened, so his theory has been rejected by the scientific community for decades.
In fact, in this era, in addition to some matching fossils on different continents, the only scientific evidence is some of the data collected by the challenger during the British Navy expedition in 1872.
During that voyage, they tried to map the depth of the Pacific Ocean by dropping the anchor off the ship every other time, measuring how much the rope used before touching the bottom.
As they sailed further into the western Pacific, they noticed that the readings began to get deeper and deeper until they reached a point near the Mariana Islands on March 25, 1875, which measured an astonishing 26,850 feet deep.
As we all know, the Mariana Trench is the deepest point on Earth.
However, no one knows why this part of the world is so deep and what may be the cause.
In 1929, Arthur Holmes looked at some of Wegener's ideas again and suggested that as the temperature of the Earth rises, its density decreases and rises to the surface where it sinks again after cooling.
Holmes's theory is that this repeated heating and cooling cycle produces a "current" that moves the mainland like a conveyor belt.
It was not until after World War II that scientific evidence began to appear in order to verify the theory of Wigan and Holmes.
In the 1940s S, the United States Navy began using sonar to help the submarine fleet navigate the sea floor and map the sea floor.
Geologists immediately noticed the huge mid-term
The ridge is basically the same mountain range as the Himalayas.
Sonar maps also show deep trenches that divide the length of the underwater mountains.
In fact, the deepest part of the ocean can be found in these trenches.
After the discovery of huge underwater ridges and trench, scientists began to use the universal meter, which found alternating magnetic fields around the ridge, which means that the ridge is constantly forming new rocks.
With the new rock "born" from Earth, the old rock is pushed further away from the ridge line, generating symmetrical magnetic strips on both sides of the ridge line.
Therefore, as the sea floor expands from the middle to all directions
The Ocean Ridge, farther from the ridge, can find the oldest sea bottom.
In addition, the trench close to or parallel to the underwater mountains is usually the deepest ocean part of the Earth.
Not only that, but the oldest sea floor is most common among these huge deep-sea trenches.
By the 1960 s, using sonar and other data collected from underwater mapping, scientists were finally able to piece together a theory based on Holmes's convection theory 30 years ago.
In essence, Wegener and Holmes are right, they just don't have the technology available in their lifetime to prove their theory.
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The cause of the earthquake: the development of scientific evidence of the opensource plate structure proves that the Earth's surface consists of a series of plates floating on the mantel.
Plate structures describe the process of how the sea floor moves, because the constant magma erupts from these underwater ridges, generating a flow of magma from the ridge to the opposite direction.
These currents create cracks on the ridge, causing molten magma to rise and form the latest seabed.
Over the course of millions of years, the new seabed has moved away from the ridges in two directions, eventually entering a continental plate, where a dive took place.
Dive action simply describes the process of diving now under the continental shelf under the ancient seabed, whether it is the North American plate or the Pacific Ocean and various other plates around the fire ring around the Earth.
The same process happens in the middle.
The Atlantic Ridge, though the area on Earth is much less active in earthquakes.
Nevertheless, the North American plate is still moving about an inch from the European plate every year.
It was the constant pressure of the push belt that caused the earthquake.
The tension of the plate grinding together, one diving under the other, it accumulates in decades or hundreds of years, until it suddenly caused several inches to several feet of vibration along the fault line of the crust.
Uncovering plate structure: Earth and space scienceScientific readers)
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The most severe earthquake in history: opensource below is the strongest earthquake in human history listed according to the Richter scale.
To understand the scale of seismic measurements, consider it from a basic level 10 perspective.
Therefore, measures 5 of the earthquake.
0 there are 10 times more than a 4 on the Richter scale.
The earthquake and energy release of about 1/3.
To be sure, there have been many more destructive earthquakes in the history of the planet, but, either no one is recording it there or there is no measurement of the Richter magnitude. Magnitude: 8.
5 Russia Kamchatka 2007 south of Sumatra, Indonesia, February 3, 1923: 8.
6 Assam-Tibet earthquake August 15, 1950 level 1957: 8 in the andlenov Islands, Alaska.
Indonesia Sumatra March 28, 2005 Aleutian Islands February 4, 1965 magnitude: 8. 8Ecuador Jan.
Chile earthquake of magnitude 1906 on February 27, 2010: 9.
0 Sumatra, Indonesia's Honshu island in December 26, 2004, Japan's Kamchatka Peninsula in March 11, 2011, Russia's November 4, 1952 magnitude: 9.
1 Aleutian Islands 2000 west coast of northern Sumatra in March 9, 1957: 9.
Prince William Bay, Alaska, March 28, 1964: Level 9.
Chile May 22, 1960-User CD-
ROM: interactive whiteboard, plate structure ,(78676)
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