Americans are responsible for about 1/5 of the world’s garbage
annually. On average, that’s 3 pounds a day per person.
Showing posts with label america. Show all posts
Showing posts with label america. Show all posts
WATERFALL
A waterfall is a place where flowing water rapidly drops in elevation as it flows over a steep
region or a cliff. Waterfalls are commonly formed when a river is young. At these times the
channel is often narrow and deep. When the river courses over resistant bedrock, erosion
happens slowly, while downstream the erosion occurs more rapidly.
Waterfall is grouped into ten broad classes based on the average volume of water present on the fall using a logarithmic scale. Types of waterfalls: block, cascade, cataract, fan, horsetail, plunge,
punchbowl, segmented, tiered, multi-step.
The highest waterfall in the world is the Angel Falls in Venezuela. Angel Falls drops 3,212 feet (979 meters) from Devil Mountain in Venezuela. The waterfall was named for Jimmy Angel, an
American flyer who discovered it in 1935 and crash-landed nearby in 1937.
Widest Waterfall – Khone Falls stretch 6.7 miles (10.8 kilometers) across the Mekong River, stopping river traffic at the Laos-Cambodia border. The highest Waterfall in Africa is the Tugela
Falls at 947 meters. It is found in South Africa. Europe’s highest Waterfall, Utigard in Norway,
is 800 meters high. Victoria Falls is the largest \Waterfall in the world and is more than a mile
long. Tugela Falls is the world’s second tallest at 947 m (3110 ft) in KwaZulu-Natal province,
Republic of South Africa.
Some Waterfalls are constructed by artificial means indoors. The largest of these is in the lobby of the International Center, in Detroit.
region or a cliff. Waterfalls are commonly formed when a river is young. At these times the
channel is often narrow and deep. When the river courses over resistant bedrock, erosion
happens slowly, while downstream the erosion occurs more rapidly.
Waterfall is grouped into ten broad classes based on the average volume of water present on the fall using a logarithmic scale. Types of waterfalls: block, cascade, cataract, fan, horsetail, plunge,
punchbowl, segmented, tiered, multi-step.
The highest waterfall in the world is the Angel Falls in Venezuela. Angel Falls drops 3,212 feet (979 meters) from Devil Mountain in Venezuela. The waterfall was named for Jimmy Angel, an
American flyer who discovered it in 1935 and crash-landed nearby in 1937.
Widest Waterfall – Khone Falls stretch 6.7 miles (10.8 kilometers) across the Mekong River, stopping river traffic at the Laos-Cambodia border. The highest Waterfall in Africa is the Tugela
Falls at 947 meters. It is found in South Africa. Europe’s highest Waterfall, Utigard in Norway,
is 800 meters high. Victoria Falls is the largest \Waterfall in the world and is more than a mile
long. Tugela Falls is the world’s second tallest at 947 m (3110 ft) in KwaZulu-Natal province,
Republic of South Africa.
Some Waterfalls are constructed by artificial means indoors. The largest of these is in the lobby of the International Center, in Detroit.
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| The Khone Waterfall |
THE INVENTION OF TELEGRAPH
Man has used all sorts of methods to send messages. In Persia, 2500 years ago, men with loud voices were placed on the mountain tops to shout out the news from one town to another. Greeks used to flash messages with lighted torches. The red Indians used smoke signals.
In 1830, an artist named Morse was sailing to America after a long stay in Europe. On board the ship there was a man demonstrating the effect of electricity on a magnet. Morse was fascinated by the demonstration and it occurred to him that electricity could be used to carry messages from one places to the other.
He devoted all his time to designing a machine which could use electricity to carry messages. Finally, after three years of hard work, he built a telegraph set. It took him another three years to persuade the government to send messages by telegraph. As the telegraph poles were being set up the workmen were often shot by hoodlums and sometimes the poles would be knocked down at night.
It was found that it was the postmaster general of the United States who was behind all the trouble. He was afraid if the telegraph became popular, people would stop sending letters and he would lose his job! The man was arrested and work on the telegraph progressed rapidly after that. The first telegraph was sent from Washington to Baltimore. The message read: What Had God Wrought.
Nowadays if we want to send urgent news quickly, all we have to do is go to the nearest telegraph office. When a telegram is sent, the receiver at the other end hears only a series of sounds representing dots and dashes. He then decodes these dots and dashes to get the message. A dot and a dash (.-) means A. A dash and three dots (-...) means B. And so on are the codes of the letters.
In 1830, an artist named Morse was sailing to America after a long stay in Europe. On board the ship there was a man demonstrating the effect of electricity on a magnet. Morse was fascinated by the demonstration and it occurred to him that electricity could be used to carry messages from one places to the other.
He devoted all his time to designing a machine which could use electricity to carry messages. Finally, after three years of hard work, he built a telegraph set. It took him another three years to persuade the government to send messages by telegraph. As the telegraph poles were being set up the workmen were often shot by hoodlums and sometimes the poles would be knocked down at night.
It was found that it was the postmaster general of the United States who was behind all the trouble. He was afraid if the telegraph became popular, people would stop sending letters and he would lose his job! The man was arrested and work on the telegraph progressed rapidly after that. The first telegraph was sent from Washington to Baltimore. The message read: What Had God Wrought.
Nowadays if we want to send urgent news quickly, all we have to do is go to the nearest telegraph office. When a telegram is sent, the receiver at the other end hears only a series of sounds representing dots and dashes. He then decodes these dots and dashes to get the message. A dot and a dash (.-) means A. A dash and three dots (-...) means B. And so on are the codes of the letters.
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| The Telegraph |
