Explanation Text

Aurora Borealis

Aurora is a natural display of light in the sky that can be seen with the unaided eye only at night. An auroral display in the Northern Hemisphere is called the aurora borealis, or the northern lights. A similar phenomenon in the Southern Hemisphere is called the aurora australis. Auroras are the most visible effect of the sun's activity on the earth's atmosphere.

Most auroras occur in far northern and southern regions. They appear chiefly as arcs, clouds, and streaks. Some move, brighten, or flicker suddenly. The most common color in an aurora is green. But displays that occur extremely high in the sky may be red or purple. Most auroras occur about 60 to 620 miles (97 to 1,000 kilometers) above the earth. Some extend lengthwise across the sky for thousands of miles or kilometers.

Auroral displays are associated with the solar wind, a continuous flow of electrically charged particles from the sun. When these particles reach the earth's magnetic field, some get trapped. Many of these particles travel toward the earth's magnetic poles. When the charged particles strike atoms and molecules in the atmosphere, energy is released. Some of this energy appears in the form of auroras.

Auroras occur most frequently during the most intense phase of the 11-year sunspot cycle. During this phase, dark patches on the sun's surface, called sunspots, increase in number. Violent eruptions on the sun's surface, known as solar flares, are associated with sunspots. Electrons and protons released by solar flares add to the number of solar particles that interact with the earth's atmosphere. This increased interaction produces extremely bright auroras. It also results in sharp variations in the earth's magnetic field called magnetic storms. During these storms, auroras may shift from the polar regions toward the equator.
Source : http://www.grantchronicles.com/auroraborealismk.htm

Discussion Text

Loch Ness Monster: Real or Hoax?


The existence of the Loch Ness monster has been debated since centuries ago.

In my opinion, there is a great chance that the Loch Ness monster, often nicknamed Nessie does exist in Loch Ness, Scotland. Many attempts to prove it, such as the famous expedition led by Dr. Robert Rines in the year 1972. He and his fellow scientists found recorded evidence using a sonar that something big indeed lives in the great loch. Many sightings by professionals that are unlikely to lie say that Nessie has the form of an aquatic animal much like the extinct plesiosaurus.

Photographs of the monster has also been taken by people trying to find evidence, and many of this photographs has been proved real and not a hoax. But unfortunately, not all of these evidence are authentic. Photographs, videos, even Nessie footprints has been faked. And until now, no one, not even scientists has come up with a carcass or live specimen of this creature. Untill then, we may never be sure that a living creture the so called Loch Ness monster is really living in the loch. I think we should keep a look out for this creature, we might find Nessie as a living dinosaur who survived extinction!

Source :

http://wiki.answers.com/Q/Bagaimanakah_contoh_teks_disscussion