Essays the causes of tsunami

The word tsunami is a Japanese word, represented by two characters: Tsunami is a set of ocean waves caused by any large, abrupt disturbance on the sea- surface.

Essays the causes of tsunami

These are called meteorites. No shower meteor is known to have ever reached the ground, which means that comet Essays the causes of tsunami is in the form of very small particles. A simplified diagram of the solar system showing the concentric orbits of the planets and the elliptical orbit of Halley's comet.

Note how the orbit of the comet crosses Earth's orbit. The "Radiant" of a Meteor Shower All of the meteors in a meteor shower come from the same direction in space.

From the ground, they appear to radiate from single location in the sky, called the radiant. It's like driving your car through a tunnel: In this case the "radiant" would be "straight ahead. For example, the "Geminids" appear to originate in the constellation Gemini. There are hundreds of meteor showers and new ones are being discovered each year.

Some of the major meteor showers are listed in the table above. Meteors produce hot trails of ionized gas behind them.

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Some of these trails may be visible in the night sky for several minutes after the meteor passes. This gas reflects radar waves and as a result the meteors can also be detected during the day. Peter Brown and his collaborators at the University of Western Ontario used ground based radars to identify 13 new meteor showers.

At its peak, a good meteor shower might produce a hundred meteors per hour, the so-called zenith hourly rate, or ZHR.

Occasionally a meteor storm takes place, where the ZHR exceeds meteors per hour. The Leonid meteor storm of was a terrific display with well over meteors per hour for about half an hour.

Comets are small bodies composed primarily of ice with a little bit of sand or gravel. A typical comet's nucleus is a few miles across. It spends most of its time in a lazy, elliptical orbit in the outer solar system where its nucleus is cold and largely inactive.

For example, Halley's comet has a period of 76 years and at its furthest point from the sun is beyond the orbit of Neptune. Here the surface temperature of the comet is about 47 degrees above absolute zero F. But during the comet's passage near the Sun, its surface heats up, some of the ice evaporates and dust is released.

Essays the causes of tsunami

Each comet has two tails, one composed of dust, the other of gas. Both tails stretch away from the nucleus and point more or less away from the Sun. This is because very hot particles coming from the Sun solar wind push the tails outward, regardless of the direction the nucleus is moving. The dust streams may look uniform but they usually consist of several individual streams, like strands of a rope.

Each strand was produced by a different passage of the comet through the inner solar system. The elliptical stream of particles also shifts very slightly from year to year owing to Jupiter's gravitational field. As a result, the number of meteors can vary from one annual shower to the next as the Earth passes through different parts of the dust stream.

By about the orbit of comet Tempel-Tuttle source of the Leonid meteors will no longer intersect the Earth's orbit. No more Leonid meteor shower. Comets are the origin of most meteor showers but a few come from asteroids. These may well be very old comets.

After enough passages through the warm, inner solar system, the ice has been completely evaporated, leaving a loose assemblage of dust particles held together by their own feeble gravity.

These so-called "rubble pile" asteroids may be the remains of former comets.

Sporadic Meteors

Nowadays, some meteors are actually bits of man-made space debris. These tend to be things like paint chips and spent rocket hardware. The meteors they produce can sometimes be identified as man-made because they travel much more slowly across the sky than natural meteors.

Simplified diagram of Earth approaching a comet's dust trail. In this diagram you are looking down onto the Earth's North Pole. Note how the morning side of Earth will plow into the dust but the evening side will be somewhat shielded. This is why there are often more visible meteors after midnight - you are then on the side of the Earth that is plowing into the dust.

How to Observe a Meteor Shower First you need to find out when the meteor shower is See the table above.ABC Index of Masonic Papers published. PS Review of Freemasonry.

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This paper reexamines the Landmarks specified by Mackey and Pound. It establishes the criteria which these two authors established to define the individual Landmarks of the fraternity and .

Free practice tests, questions and resources for tests such as the SAT, GRE and GMAT. helps you with high school, college and graduate test prep. By: Publius Decius Mus September 5, Publius Decius Mus was the pseudonym of Michael Anton, who in January of left the private sector to serve on the National Security Council.

Essays the causes of tsunami

The Causes of Tsunami All tsunamis are caused by the sudden displacement of large volumes of water. All are the result of violent events with enough power to displace large volumes very rapidly. All are the result of violent events with enough power to displace large volumes very rapidly.

Create, study, print, share and download millions of flashcards. makes studying easier! Partly because of these data limitations, 15 of 20 tsunami warnings issued since were considered false alarms because the tsunami that arrived was too weak to cause damage.

Essay # 7. Risk Assessment of Tsunami.

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