Mangrove
A mangrove is a tropical marine tree. Mangroves have special aerial roots and salt-filtering tap roots which enable them to thrive in brackish water. Brackish water is salty but not as salty as sea water. Mangrove trees are commonly planted and found in coastal areas. Mangroves can serve as walls of protection for natural disaster in coastal area like tsunami. According to BBC News, healthy mangrove forests had helped save lives in the Asia disaster tsunami and people tended to respect these natural barriers even more, especially after the tsunami.
There are several species of mangrove tree found all over the world. Some prefer more salinity, while others like to be very-close to a large fresh water source such as river. Some prefer areas that are sheltered from waves. Some species have their roots covered with sea water every day during high tide. Other species grow on dry land but are still part of the ecosystem. The Times of India reported that rare species of mangrove had been found and was also known as the looking-glass tree, probably because the leaves are silver-coated.
Mangroves need to keep their trunk and leave above the surface of the water. Yet they also need to be firmly attached to the ground so they are not moved by waves.
Any part of root that appears above the water flows oxygen to the plant under water surface. as the soil begin to build up, these roots procedure additional roots that become embedded in the soil.
Volcanic Eruptions
Volcanic eruptions have caused some of the worst disasters in the world. They can wipe out entire cities and kill thousands of people.
The name of volcano comes from Roman term. It derives from VULCAN which is the name of Roman fire god. Romans believed that Vulcan lived on a volcanic Italian coast. Romans called the island VULCANO.
According to scientists, volcanic eruptions are divided in to four basic groups. They are commonly known as Hawaiian, Strombolian, Vulcanian and Peleean. The term of Hawaiian eruptions are named after the volcanoes in Hawaii. These volcanic eruptions are the least violent type. They produce highly fluid lava which flows quietly. This gradually builds up a shield volcano.
Strombolian eruptions are named after Stromboli. These result from the constant release of gas from the magma. As the gas escapes, it produces tephra that piles up, turning into a cinder cone. Strombolian eruptions happen when sticky magma plugs the central vent. This makes the magmatic gas build up pressure until it blasts. The magma is turned into volcanic dust and bombs.
Vulcanian eruption which comes from the ancient Roman belief, are more violent than the strombolian eruption. Vulcanian eruption happens and brings magma which is more viscous. Vulcanian explosions are usually larger and noisier than the Strombolian eruptions.
Paleean eruptions are famous as the most violent kind of volcanic eruptions. The name of paleean comes from the eruption of Mount Pelee, Martinique in 1902. It killed almost 38 thousands people. A Peleean eruption occurs when the magmatic gas build up tremendous pressure. This causes violent explosions with glowing clouds of hot ash and dust.
Human Body
Human body is actually a living machine and is like all other machines. This living machine needs fuel to supply it with energy. The fuel is provided by the food which we eat. However do we know how much we need to stay healthy?
The energy value of food is usually measured in calories. A calorie is the amount of heat which is required to raise the temperature of 1 kg of water by 1 degree C. The number of calories which people need per day varies. It depends on the activity which the people are involved in. For example; people will need more calories for standing than for sitting, people need more for running than for walking, etc.
The energy which is provided by food is in the form of three kinds of chemical substances. They are carbohydrate, protein and fat. Carbohydrate provides 8.8 calories per gram (cal/gm) of energy, protein 4.0 cal/gm and fat 8.0 cal/gm. Each food contains different proportion of these substances. These three chemical substances are all important for body staying healthy.
Platypus
Many people call platypus duckbill because this animal has a bill like duckbill. Platypus is a native Tasmania and southern and eastern Australia.
Platypus has a flat tail and webbed feet. Its body length is 30 to 45 cm and covered with a thick, and woolly layer of fur. Its bill is detecting prey and stirring up mud. Platypus' eyes and head are small. It has no ears but has ability to sense sound and light.
Platypus lives in streams, rivers, and lakes. Female platypus usually dig burrows in the streams or river banks. The burrows are blocked with soil to protect it from intruders and flooding. In the other hand, male platypus does not need any burrow to stay.
Earthquake
Earthquake often happens around us. It brings great damages. Earthquake is hard to be predicted and that makes lot victims.
Actually there are three kinds of earthquake. This kinds of earthquake are commonly base on the factor and geological area where the earthquakes happen. These three kinds of earthquake are tectonic, volcanic and explosion.
Tectonic earthquakes is most common one. This kind of earthquake happens while earth's crust rocks break because of the geological strength created by moving of the earth's plates.
Volcanic earthquakes happen exactly with volcanic activity. Volcanic earthquakes are when the volcano produces acidic lava, which drys quickly, when it drys quickly it blocks the top of the volcano. This make no more magma can escape. Pressure starts to build up and eventually the acidic lava can no longer stand the pressure. So the volcano is free to explode, the pressure is released so fast that an earthquake is caused. A volcanic earthquake is usually kept within 10-20 miles of the volcano.
Explosion earthquakes are the result of the collapse earthquakes that are small earthquakes occurring in underground mines and caverns.
KOMODO DRAGON
Do you know what is the largest lizard? This lizard is called komodo. It lives in the scrub and woodland of a few Indonesian islands.
Komodo dragon is the world's heaviest lizard, weighing 150 pounds or more. The largest Komodo ever measured was more than 10 feet (3 meters) long and weighed 366 pounds (166 kg) but the average size of komodo in the wild is about 8 feet (2.5 meters) long and 200 pounds (91 kg)
Komodo has gray scaly skin, a pointed snout, powerful limbs and a muscular tail. They use their keen sense of smell to locate decaying animal remains from several miles away. They also hunt other lizards as well as large mammals and are sometimes cannibalistic.
The Komodo dragon's teeth are almost completely covered by its gums. When it feeds, the gums bleed, creating an ideal culture for virulent bacteria. The bacteria that live in the Komodo dragon's saliva causes septicemia, or blood poisoning, in its victims. A dragon will bite its prey, then follow it until the animal is too weak to carry on.
This lizard species is threatened by hunting, loss of prey species and habitat loss.
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