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9/29/12

Vulture Is A Large Bird Of Prey Its Natural Images Collection

About Vulture:

Vulture is a large bird of prey.A particular characteristic of many vultures is a bald head, devoid of normal feathers. This helps to keep the head clean when feeding.Vultures are classified into two groups: Old World Vultures and New World Vultures. Vultures are found on every continent except Australia and Antarctica. New World Vultures are found in North and South America and Old World Vultures found in Europe, Africa and Asia.Vultures do not hunt live animals. Instead, they feed on carrion. Carrion is the meat of an animal that is already dead. Some vultures eat scraps left by predators such as hyenas or lions.

Images:

Vulture's Image

Vulture's Image

9/23/12

Thunder And Lighting Description Protection And Images Collection

Description Thunder And Lighting:

Thunder Lightning is a massive electrostatic discharge caused by unbalanced electric charge in the atmosphere. Lightning can be either inside clouds , cloud to cloud or cloud to ground and is accompanied by the loud sound of thunder. Because the speed of sound in air is so much slower than the speed of light. Thunder often lasts several seconds because the sounds from different parts of the lightning strike arrive at different times.

A typical cloud to ground thunder lightning strike is often over 5-6 km. long but may be many kilometers longer. Lightning is usually associated with and produced by cumulonimbus clouds which may reach up to 15 km high and often have a base 5-6 km. above the ground.

The fear of thunder lightning is called astraphobia because of the severe danger of a close lightning strike this fear may be appropriate. The study or science of lightning is called fulminology and someone who studies lightning is referred to as a fulminologist.

Each major stroke of a thunder lightning strike is usually about 150 ft. long and lasts about 1 to 2 microseconds with a pause of about 50 microseconds as more charge is accumulated before resuming another stroke in a slightly or significantly different direction.

Protection:

Keep a weather radio during thunder lightning season, especially when participating in outdoor activities.
Don't plan outdoor activities when lightning are predicted.
Be aware of the general weather patterns in own area and plan smart. For example, an evening outdoor wedding in June in Minnesota had better have an indoor back-up plan it would be much better to plan it for noon.
When camping, set up camp in or by a low grove of trees, preferably close to the floor of a valley. Stay off hilltops and avoid wide open fields .
Stay off water and away from water when lightning approach.If you are outdoors when a storm approaches, the best thing to do is get indoors.

Roll up all the windows, close the doors, and do not touch anything metal. Do not use the radio or any other electronic devices until the storm lightning is well past.

Images:

Lightning Image

Lightning Image

Lightning Image

9/14/12

Cave Its Description Type Of Cave Longest Cave In World And Images Collection

Description Of Cave:

A cave or cavern is a natural underground space large enough for a human to enter. Caves form naturally by the weathering of rock and they often extend deep underground. The word "cave" can also refer to much smaller openings such as sea caves, rock shelters, andgrottos.

Caves are found throughout the world but only a portion of them have been explored and documented by cavers. The distribution of documented cave systems is widely skewed toward countries where caving has been popular for many years (such as France, Italy, Australia, the UK, the United States, and so on.). This is a great generalization as large expanses of North America and Asia contain no documented caves where as areas such as the Madagascar dry deciduous forests and parts of Brazil contain many documented caves. As the world’s expanses of soluble bedrock are researched by cavers.The distribution of documented caves is likely to shift. For example, China, despite containing around half the world's exposed limestone .More than 1,000,000 square kilometres has relatively few documented caves.

Types Of Cave:
1. Solutional cave
2. Primary cave
3. Sea cave or littoral cave
4. Corrasional cave or erosional cave
5. Glacier cave
6. Fracture cave
7. Talus cave
8. Anchialine cave

World's five longest surveyed caves
1. Mammoth Cave, Kentucky( USA)
2. Jewel Cave, South Dakota( USA)
3. Optymistychna Cave(Ukraine)
4. Wind Cave, South Dakota (USA)
5. Sistema Sac Actun (Mexico)

Images:

Cave Its Description Type Of Cave Longest Cave In World And Images Collection

Cave Image

Cave Images

Image Of Cave

8/20/12

Glaciers Short History And Amazing Images Collection

Short History Of Glaciers:

A huge mass of ice slowly flowing over a land mass. Glaciers form over many years from packed snow in areas where snow accumulates faster than it melts. A glacier is always moving, but when its forward edge melts faster than the ice behind it advances, the glacier as a whole shrinks backward.

Large mass of perennial ice that forms on land through the recrystallization of snow and that moves forward under its own weight. The term ice sheet is commonly applied to a glacier that occupies an extensive tract of relatively level land and that flows from the centre outward. Glaciers occur where snowfall in winter exceeds melting in summer, conditions that prevail only in high mountain areas and polar regions. Glaciers occupy about 11 of the Earth's land surface but hold roughly threetofourths of its fresh water. 99 of glacier ice lies in Antarctica and Greenland.

Glaciers are of four chief types. Valley, or mountain, glaciers are tongues of moving ice sent out by mountain snowfields following valleys originally formed by streams. In the Alps there are more than 1,200 valley glaciers. Piedmont glaciers which occur only in high latitudes are formed by the spreading of valley glaciers where they emerge from their valleys or by the confluence of several valley glaciers. Small ice sheets known as ice caps are flattened, somewhat dome-shaped glaciers spreading out horizontally in all directions and cover mountains and valleys. Continental glaciers are huge ice sheets whose margins may break off to form icebergs. During glacial periods they were far more widespread. Glaciers may be classified as warm or cold depending on whether their temperatures are above or below −10°C.

The causes of glacial movement are exceedingly complex and doubtless are not all operative on the same glacier at the same time. Important elements in glacial movement are melting under pressure followed by refreezing, which may push the mass in the direction of least resistance; sliding or shearing of layers of ice one on top of the other; and rearrangement of the granules when pressure causes melting. Sudden, rapid movements of glaciers, called glacier surges, have been observed in Alaskan and other glaciers, with evidence for such abnormal movements as the crumpled lines of surface debris found on them. It is thought that the relatively sudden movement and melting of glaciers may be indicative of climate warming.

The world's glaciers are slowly disappearing. Global temperatures have risen by about 1 degree Fahrenheit over the last century with winter temps having risen as much as 7 degrees Fahrenheit in the Arctic region.

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