noun. a descent of water over a steep surface; a waterfall, especially one of considerable size.
What is the definition of cataract in geography?
cataract, a waterfall (q.v.), especially one containing great volumes of water rushing over a precipice.
What is the difference between a cataract and a waterfall?
As nouns the difference between waterfall and cataract
is that waterfall is a flow of water over the edge of a cliff while cataract is (obsolete) a waterspout.
Why are waterfalls called Cataracts?
It’s a derivative of katarassein, from kata– “down” plus arassein “strike, smash”. … It was soon after applied to a large waterfall, strictly one in which the water plummets over a precipice; this came from a Latin use of the word to describe the Cataracts of the Nile.
Cataract. a large waterfall, any strong flood or rush of water. delta. a triangular shaped plain at the mouth of a river formed when sediment is deposited by flowing water.
What are cataracts of a river?
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 are cataracts in mountains?
Cataract Mountain | |
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Easiest route | class 3 |
What is cascade and cataract?
A waterfall may also be termed a falls or sometimes a cataract, the latter designation being most common when large volumes of water are involved. Waterfalls of small height and lesser steepness are called cascades; this term is often applied to a series of small falls along a river.
What are the 3 types of cataracts?
- Nuclear Sclerotic Cataracts. …
- Cortical Cataracts. …
- Posterior Subcapsular Cataracts.
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.
Why is it called a cataract?
“Cataract” is derived from the Latin cataracta, meaning “waterfall”, and from the Ancient Greek καταρράκτης (katarrhaktēs), “down-rushing”, from καταράσσω (katarassō) meaning “to dash down” (from kata-, “down”; arassein, “to strike, dash”).
Where are cataracts waterfall?
Cataract Falls is one of the most popular falls trails in Marin County within the San Francisco Bay Area. This is a great hike with scattered cascading waterfalls along the entirety of the trail. The trailhead is located off of Bolinas Fairfax Road, just past Alpine Lake.
What does cataract mean in Latin?
Latin cataracta waterfall, portcullis, from Greek kataraktēs, from katarassein to dash down, from kata- + arassein to strike, dash.
What are cataracts and rapids?
is that rapid is (often|in the plural) a rough section of a river or stream which is difficult to navigate due to the swift and turbulent motion of the water while cataract is (obsolete) a waterspout.
What were the delta and the cataracts?
The Nile Delta area is very rich farmland, created by the predictable flooding of the Nile, making irrigation easier. A cataract is a waterfall and rapids. There are six along the Nile River.
How is a cataract waterfall formed?
A cataract waterfall occurs when a large amount of fast-moving water falls over a cliff. This type is categorized based on sheer size and power. Standing next to one can make you feel exceptionally small and fragile, and reminds viewers of the extraordinary strength of nature.
Are cataracts water?
a descent of water over a steep surface; a waterfall, especially one of considerable size. any furious rush or downpour of water; deluge.
How did cataracts help Egypt?
Nile’s cataracts helped and hurt Egypt by flooding every year and bringing down boulders and trees. The Egyptians were protected from invaders due to their geographical features. Furthermore, the cataracts in the Nile to the south protected the Egyptians from lands below them.
Where is the third cataract located?
The 3rd Cataract presents very interesting rocky formations. It is located north of Kerma, the ancient capital of the Kingdom of Kush, which lasted for over 1.000 years before falling under the control of the Egyptians thanks to the natural protection offered by the cataract itself.
How did cataracts in the Nile river make transportation difficult?
How did cataracts in the Nile River make transportation difficult? Cataracts caused parts of the riverbed to dry out. Cataracts contained rocks and boulders that made the river impassable.
What is a block waterfall?
Block waterfalls, also referred to as rectangle waterfalls, are the kind of waterfalls that have the “classic” waterfall appearance. In other words, these are the type of waterfalls that adopt a rectangular shape as they fall. The underlying cliff face of this waterfall is commonly at a vertical standing.
What do you call a mini waterfall?
Waterfalls of small height and lesser steepness are called cascades; this term is often applied to a series of small falls along a river. Still gentler reaches of rivers that nonetheless exhibit turbulent flow and white water in response to a local increase in channel gradient are called rapids.
What is waterfall called?
Waterfalls are also called cascades. The process of erosion, the wearing away of earth, plays an important part in the formation of waterfalls.
https://youtube.com/watch?v=icYLMmENk_c
Do cataracts grow back?
No, cataracts cannot grow back.
However, sometimes after successful cataract surgery, the natural capsule that is left behind becomes cloudy. This causes the vision to become blurry again, much like it was before cataract surgery.
Can cataracts grow quickly?
Because most age-related cataracts typically develop over a span of years, it’s a relatively slow process. However, some types of cataracts may develop faster, such as in individuals with diabetes, where cataracts can develop rapidly.
What causes cataracts to grow quickly?
Trauma-related cataracts are typically the most fast-growing type of cataracts. Radiation: Radiation-related cataracts, sometimes listed under trauma-related cataracts, occur after the lens has been exposed to radiation. Exposure to high levels of radiation can result in clouded vision in as little as two years.
What is the most common type of cataract?
As you age, a cataract can develop because of natural changes in the lens of your eye. This is called an age-related cataract, and it’s the most common type of cataract. Age-related cataracts may be more likely to form if you: Smoke.
Can you see a cataract in the mirror?
At some point, the maturing lens begins to opacify, blocking and scattering the light entering the eye. If left untreated, a cataract will naturally continue to progress. In some cases, the maturing cataract becomes completely white and can be seen in the mirror or by others.
What’s the difference between glaucoma and cataracts?
Glaucoma and cataracts affect two different areas of the eyes. Glaucoma involves eye pressure and affects the optic nerve, and cataracts involve the breakdown of proteins and affect the lens.
What is cataract Class 8?
What is CATARACT. Sometimes due to the formation of a membrane over the crystalline lens of some people in the old age, the eye lens becomes hazy or even opaque. This is called cataract. It results in decrease or loss in vision of the eye.
Who found cataract?
In 1753, Samuel Sharp performed the first documented intracapsular cataract extraction (ICCE).
What causes cataracts in a child?
Cataracts are caused by a build-up of protein in the eye. In children, congenital cataracts can be present from birth. They can also appear as a result of eye injuries (known as ‘traumatic cataracts’) or following eye surgery for other problems. When a child has cataracts, their education will start to suffer.
Are there cataracts on the Mississippi river?
Cataracts are waterfalls on very large rivers. … It is used for waterfalls along the River Nile in Egypt, which are little more than steps, but there are steps in other places, too. One of the most famous is on the Mississippi.
What does vision look like with cataracts?
Blurry vision at any distance is the most common symptom of cataracts. Your view may look foggy, filmy, or cloudy. Over time, as the cataracts get worse, less light reaches the retina. People with cataracts may have an especially hard time seeing and driving at night.
How did glaucoma get its name?
The word “glaucoma” is from the Ancient Greek glaukos, which means “shimmering.” In English, the word was used as early as 1587 but did not become commonly used until after 1850, when the development of the ophthalmoscope allowed doctors to see the optic nerve damage.
What is night blindness?
Night blindness (nyctalopia) is your inability to see well at night or in poor light such as in a restaurant or movie theater. It is often associated with an inability to quickly adapt from a well-illuminated to a poorly illuminated environment.
What are rapids in geography?
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. This process is known as differential erosion.
Where is the first cataract?
The Nile River is shown above passing the granite islands that form the first cataract at Aswan City, Egypt. Cataracts occur where outcrops of granite, as well as other resistant rocks, reach the banks of the Nile River.