What is the difference between a waterfall and a cataract?
Horsetail: Descending water maintains some contact with bedrock. Cataract: A large, powerful waterfall. Multi-step: A series of waterfalls one after another of roughly the same size each with its own sunken plunge pool. Block: Water descends from a relatively wide stream or river.
Why is a waterfall called a cataract?
The term “cataract” is derived from the Latin, “cataracta” which means “waterfall” and the Greek” katarhaktes” which means “waterfall, broken water; swooping, rushing down”.
Where is a cataract landform located?
The Cataracts of the Nile are shallow lengths (or whitewater rapids) of the Nile River, between Khartoum and Aswan, where the surface of the water is broken by many small boulders and stones jutting out of the river bed, as well as many rocky islets.
What is rapid and cataract in geography?
Rapid Rapid is a reflection of a river or stream while cataract is a pure water spout .
What is cataract of a river?
cataract, a waterfall (q.v.), especially one containing great volumes of water rushing over a precipice. Rhine Falls. Rhine Falls, on the upper Rhine River near Schaffhausen, Switzerland. Phter.
What do cataracts mean?
A cataract is a cloudy area in the lens of your eye. Cataracts are very common as you get older. In fact, more than half of all Americans age 80 or older either have cataracts or have had surgery to get rid of cataracts.
What is a cataract in water?
a descent of water over a steep surface; a waterfall, especially one of considerable size. any furious rush or downpour of water; deluge.
What is an example of a cataract?
A cataract is a clouding of the normally clear lens of the eye. For people who have cataracts, seeing through cloudy lenses is a bit like looking through a frosty or fogged-up window.
What is cataract in world history?
Cataract dates to the 14th century and comes from the Latin word cataracta, meaning "portcullis." The Latin pertains to the ocular cataract, probably because it obstructs one's vision much like the portcullis's heavy iron grating obstructs passage into a fortress or castle.
What is Rapido in geography?
The Rapido is a short river ( c. 40 kilometres (25 mi)) which flows in the Italian province of Frosinone. The river is known for the Battle of the Rapido River, despite it actually occurring on the Gari River. Rapido. Location.
What is a cataract in the Nile?
The Cataracts of the Nile are shallow lengths of the Nile River, between Khartoum and Aswan, where the surface of the water is broken by many small boulders and stones jutting out of the river bed, as well as many rocky islets.
What is meaning of the term cataract?
Listen to pronunciation. (KA-tuh-RAKT) A condition in which the lens of the eye becomes cloudy. Symptoms include blurred, cloudy, or double vision; sensitivity to light; and difficulty seeing at night.
Why cataract is formed?
Most cataracts develop when aging or injury changes the tissue that makes up the eye's lens. Proteins and fibers in the lens begin to break down, causing vision to become hazy or cloudy. Some inherited genetic disorders that cause other health problems can increase your risk of cataracts.
Where do cataracts come from?
Most cataracts are caused by normal changes in your eyes as you get older. When you're young, the lens in your eye is clear. Around age 40, the proteins in the lens of your eye start to break down and clump together. This clump makes a cloudy area on your lens — or a cataract.
What is a cataract in the Nile river?
The Cataracts of the Nile are shallow lengths of the Nile River, between Khartoum and Aswan, where the surface of the water is broken by many small boulders and stones jutting out of the river bed, as well as many rocky islets.
What is cataract short answer?
A cataract is a cloudy area in the lens of the eye that leads to a decrease in vision. Cataracts often develop slowly and can affect one or both eyes. Symptoms may include faded colors, blurry or double vision, halos around light, trouble with bright lights, and trouble seeing at night.
What does cataract mean in ancient Egypt?
The word cataract comes from the Greek word Katarakhtes meaning "waterfall". In ancient times, Upper Egypt extended from the Nile Delta to the first cataract. Further upstream, in what is modern Sudan, the land was later controlled by the Kingdom of Kush.
What is gorge in geography?
A gorge is a narrow valley with steep, rocky walls located between hills or mountains. The term comes from the French word gorge, which means throat or neck. A gorge is often smaller than a canyon, although both words are used to describe deep, narrow valleys with a stream or river running along their bottom.
What is Rapido in river topography?
Rapids are areas of shallow, fast-flowing water in a stream. Rapids tend to form in younger streams, with water flow that is straighter and faster than in older streams. Softer rocks in the streambed erode, or wear away, faster than harder rocks.
How did the cataracts help Egypt?
The cataract system created a natural boundary at Aswan, separating Egypt from its southern neighbor, Nubia.
How did cataracts affect Egypt and Nubia?
How did the cataracts of the Nile affect Nubian trade? The cataracts prevented Nubians from trading by traveling on the river, so Nubian trade routes had to be over land.
What is a cataract made of?
A cataract occurs when there is a buildup of proteins in the lens, creating protein clumps. These clumps, or deposits, prevent light from passing clearly through the lens, thus disrupting normal vision. There are several reasons why a cataract may form including: Aging – The eyes mainly consist of water and protein.
What is a cataract river?
cataract, a waterfall (q.v.), especially one containing great volumes of water rushing over a precipice. Rhine Falls. Rhine Falls, on the upper Rhine River near Schaffhausen, Switzerland. Phter.
What is a cataract in history?
Cataracts may actually be one of the first ailments people attempted to treat surgically. Our earliest records of it date back to 600 BC. In those days, they used something called the “couching” technique, which involved smacking the eye with a blunt object until the lens dislodged entirely.
Are the cataracts Egypt?
Individuals can find the cataracts between Aswan in Egpyt and Khartoum in Sudan. Five of the six major sections are located in Sudan, with one in Egypt at Aswan.
What is cataract class 10th?
A cataract is a clouding of the eye's natural lens, which lies behind the iris and the pupil. Cataracts are the most common cause of vision loss in people over age 40 and is the principal cause of blindness in the world.
What is potholes in geography?
Potholes: Potholes are circular depressions formed because of stream erosion aided by the abrasion of rock fragments. Once a small and shallow depression forms, pebbles and boulders get collected in those depressions and get rotated by flowing water and consequently the depressions grow in dimensions.
What is a gorge vs canyon?
A canyon is a deep valley having steep sides, and a gorge is a deep ravine with a river flowing through it or a ravine without the river.
What are rapids Upsc?
RAPIDS and CATARACTS: When a river runs over alternating layers of hard and soft rock, rapids and waterfalls may form. Due to the unequal resistance of hard and soft Rocks traversed by a river the outcrop of a band of hard rock may cause a river to jump or fall down stream. Thus, rapids are formed.
What is cataract in ancient Egypt?
In fact, “cataract” means both an opacity of the lens and a torrent of water and is derived from the Greek word kataráktēs meaning the fall of water. A wall painting in an ancient tomb at Thebes (about 1200 B.C.) seems to reveal the treatment of an eye by an oculist.