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The Great Pyramid

The Great Pyramid of Giza (also called the Khufu’s Pyramid, Pyramid of Khufu, and Pyramid of Cheops) is the oldest and largest of the three pyramids in the Giza Necropolis bordering what is now Cairo, Egypt, and is the only one of the Seven Wonders of the Ancient World that survives substantially intact. It is believed the pyramid was built as a tomb for Fourth dynasty Egyptian King Khufu (Cheops in Greek) and constructed over a 20 year period concluding around 2560 BC. The Great Pyramid was the tallest man-made structure in the world for over 3,800 years.

Originally the Great Pyramid was covered by casing stones that formed a smooth outer surface, and what is seen today is the underlying core structure. Some of the casing stones that once covered the structure can still be seen around the base. There have been varying scientific and alternative theories regarding the Great Pyramid’s construction techniques. Most accepted construction theories are based on the idea that it was built by moving huge stones from a quarry and dragging and lifting them into place.

Source: Wikipedia

Southern face of the Great Pyramid.
The base originally measured about 230.33m square.
The original height was 146.59m.

Location

Location: 29° 59′ N    31° 09′ E

Satellite images of the Egyptian Pyramids

satellite image has been generated by Google

Tiger Shark vs. Albatross

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Tiger Shark vs. Albatross

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The tiger shark, Galeocerdo cuvier is a species of requiem shark and the only member of the genus Galeocerdo. Mature sharks average 3.25 to 4.25 m (11 to 17 ft) longand weigh 385 to 635 kilograms (850 to 1,400 lb). It can attain a length of over 7.25 m (24 ft) and a weight of 900 kg (1900 lb) at maximum. It is found in many of the tropical and temperate regions of the world’s oceans, and is especially common around islands in the central Pacific. This shark is a solitary hunter, usually hunting at night. Its name is derived from the dark stripes down its body, which fade as the shark matures.

The tiger shark is a predator, known for eating a wide range of items. Its usual diet consists of fish, seals, birds, smaller sharks, squid, turtles, and dolphins. It has sometimes been found with man-made waste such as license plates or pieces of old tires in its digestive tract and is often referred to as “the wastebasket of the sea”.

This shark may be easily identified due to its dark stripes which are similar to a tiger pattern. It also has dorsal fins that are distinctively close to its tail. These sharks are often large in size and may encounter humans because they often visit shallow reefs, harbours and canals.

Second only to the great white shark in number of recorded attacks on humans,the tiger shark is considered, along with the great white, bull shark and the oceanic whitetip shark to be one of the sharks most dangerous to humans. This may be due to its aggressive nature and frequency of human contact as it often inhabits populated waters such as Hawaiian beaches.


Taxonomy

The shark was first described by Peron and Lessueur in 1822 and was given the name Squalus cuvier.Müller and Henle, in 1837 renamed it Galeocerdo tigrinus. The genus, Galeocerdo, is derived from the Greek, galeos which means shark and the Latin cerdus which means the hard hairs of pigs.It is often colloquially called the man-eater shark.

The tiger shark is a member of the order Carcharhiniformes; members of this order are characterized by the presence of a nictitating membrane over the eyes, two dorsal fins, an anal fin, and five gill slits. It is the largest member of the Carcharhinidae family, commonly referred to as requiem sharks. This family includes some other well-known sharks such as the blue shark, lemon shark and bull shark.

Distribution and habitat

The tiger shark is often found close to the coast, in mainly tropical and sub-tropical waters worldwide, though they can reside in temperate waters. Along with the Pacific sleeper shark, Greenland shark and sixgill shark, tiger sharks are among the largest predatory sharks after the great white. [3] The shark’s behavior is primarily nomadic, but is guided by warmer currents, and it stays closer to the equator throughout the colder months. The shark tends to stay in deep waters that line reefs but does move into channels to pursue prey in shallower waters. In the western Pacific Ocean, the shark has been found as far north as Japan and as far south as New Zealand.

The shark has been recorded down to a depth just shy of 900 metres (3,000 ft) but is also known to move into shallow water – water that would normally be considered too shallow for a species of its size. In addition, the tiger shark, like many other sharks, has a reflective layer behind the retina called tapetum lucidum which allows light-sensing cells a second chance to capture photons of visible light, enhancing vision in low light conditions.

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