What causes cataracts in rivers?
The Nubian Swell has diverted the river's course to the west, while keeping its depth shallow and causing the formation of the cataracts. Even as the river bed is worn down by erosion, the landmass is lifted, keeping parts of the river bed exposed.
What does cataract mean in 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.
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”.
What is the difference between cataract and waterfall?
A cataract is a type of waterfall with a large, single vertical drop, usually falling clear of the bedrock. A cascade waterfall is used to describe a waterfall running over an irregular steep surfaced gradient where the water is generally in contact with the river bedrock.
What does a cataract look like?
Clouded, Spotty, and Double Vision Like we previously stated, a cataract is characterized by cloudy eyes and vision. Because of the cloudiness cataracts cast over the lens of people's eyes, looking through an eye lens that is diseased with cataracts may seem like looking through a fog.
What is cataract and how is it treated?
A cataract is a clouding of the normally clear lens of the eye. Cataracts are treated by removing the cloudy lens of the eye with surgery. Sun protection and quitting smoking may help prevent cataracts. Cataracts are common in older people.
Where are the six cataracts?
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.
Where are the 6 cataracts of the Nile?
Yes, the Nile's most significant rapids are the six “Cataracts of the Nile.” The Cataracts of the Nile are a long, shallow stretch of the river between Khartoum, Sudan, and Aswan, Egypt.
Why is it called a cataract?
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 does cataract mean in geography?
a waterfall cataract, a waterfall (q.v.), especially one containing great volumes of water rushing over a precipice.
Why is it called cataracts?
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 a cataract in geography?
cataract, a waterfall (q.v.), especially one containing great volumes of water rushing over a precipice.
What are the 3 types of cataracts?
There are three primary types of cataracts: nuclear sclerotic, cortical and posterior subcapsular.
- Nuclear Sclerotic Cataracts. …
- Cortical Cataracts. …
- Posterior Subcapsular Cataracts.
What is the main cause of cataract?
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.
Where did the Egyptians come from?
Most Egyptians were probably descended from settlers who moved to the Nile valley in prehistoric times, with population increase coming through natural fertility. In various periods there were immigrants from Nubia, Libya, and especially the Middle East.
Is the Nile fresh or saltwater?
Answer. The Nile supports freshwater marshes and swamps as it winds its way north, and brackish wetlands near its delta on the Mediterranean Sea.
Can a waterfall be called a cataract?
cataract, a waterfall (q.v.), especially one containing great volumes of water rushing over a precipice.
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.
What is an example of a cataract?
For people who have cataracts, seeing through cloudy lenses is a bit like looking through a frosty or fogged-up window. Clouded vision caused by cataracts can make it more difficult to read, drive a car (especially at night) or see the expression on a friend's face.
What is the main cause of cataracts?
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.
What skin color were Egyptian?
Ancient Egyptians Were Likely To Be Ethnically Diverse Instead, they simply classified themselves by the regions where they lived. Scholarly research suggests there were many different skin colours across Egypt, including what we now call white, brown and black.
What race were Egyptian?
Ethnic groups. The population of the Nile valley and delta, which are home to the overwhelming majority of Egyptians, forms a fairly homogeneous group whose dominant physical characteristics are the result of the admixture of the indigenous African population with those of Arab ancestry.
Are piranhas in the Nile?
Known as the “piranha of Africa,” the giant tigerfish is one of several fish species that makes its home in the Nile. Their large, razor-like teeth and strong jaws make these fish vicious carnivores.
Why are there no crocodiles in the Nile river?
Construction of the Aswan High Dam in 1960 has pushed their nests towards man-made Lake Nasser. Because our Authentic Nile Cruises embark from Luxor and cease in Aswan there is little chance a ravenous croc will present itself.
Why is a cataract so called?
The word cataract comes from the Latin word “cataracta” meaning waterfall, with the condition possibly therefore named after the white appearance of rapidly running water.
Where is cataract waterfall?
cataract, a waterfall (q.v.), especially one containing great volumes of water rushing over a precipice. Rhine Falls, on the upper Rhine River near Schaffhausen, Switzerland. This article was most recently revised and updated by Amy Tikkanen.
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.
Who are the black pharaohs?
In the 8th century BCE, he noted, Kushite rulers were crowned as Kings of Egypt, ruling a combined Nubian and Egyptian kingdom as pharaohs of Egypt's 25th Dynasty. Those Kushite kings are commonly referred to as the “Black Pharaohs” in both scholarly and popular publications.
Why are Egyptian statues missing noses?
However, there is one growing consensus within the Ancient Egyptian historical academia. The Egyptians were deeply religious people and intentionally broke the statues' noses to avoid the pharaohs' wrath while also showing their distaste for previous rulers by ordering these statues to be shattered.
What race built the pyramids?
the Egyptians It was the Egyptians who built the pyramids.