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2. Blue field entoptic phenomenon - Wikipedia

   en.wikipedia.org/wiki/Blue_field_entoptic_phenomenon

   In a technique known as blue field entoptoscopy, the effect is used to estimate the blood flow in the retinal capillaries.The patient is alternatingly shown blue light and a computer generated picture of moving dots; by adjusting the speed and density of these dots, the patient tries to match the computer generated picture to the perceived entoptic dots.

3. Rift valley - Wikipedia

   en.wikipedia.org/wiki/Rift_valley

   A rift valley is a linear shaped lowland between several highlands or mountain ranges produced by the action of a geologic rift. Rifts are formed as a result of the pulling apart of the lithosphere due to extensional tectonics .

4. List of largest rifts, canyons and valleys in the Solar System

   en.wikipedia.org/wiki/List_of_largest_rifts...

   (The ridge also has a secondary rift valley running its length.) The width is an average taken along the spreading ridges (Georgia–Senegal, Brazil – Bight of Benin, etc.). The greatest depth is the Romanche Trench. (The Puerto Rico Trench is not part of the rift system.) Great Rift Valley: 6,000 km (3,700 mi) 220 km (140 mi) 2 km (1 mi)

5. Midcontinent Rift System - Wikipedia

   en.wikipedia.org/wiki/Midcontinent_Rift_System

   The Midcontinent Rift System (MRS) or Keweenawan Rift is a 2,000 km (1,200 mi) long geological rift in the center of the North American continent and south-central part of the North American plate. It formed when the continent's core, the North American craton , began to split apart during the Mesoproterozoic era of the Precambrian , about 1.1 ...

6. Afar Triangle - Wikipedia

   en.wikipedia.org/wiki/Afar_Triangle

   The Afar Triangle (also called the Afar Depression) is a geological depression caused by the Afar triple junction, which is part of the Great Rift Valley in East Africa. The region has disclosed fossil specimens of the very earliest hominins ; that is, the earliest of the human clade, and it is thought by some paleontologists to be the cradle ...

7. Half-graben - Wikipedia

   en.wikipedia.org/wiki/Half-graben

   The half grabens may have alternating polarities along the rift axis, dividing the rift valley into segments. [ 4 ] Intracontinental and marine rift basins such as the Gulf of Suez , East African Rift , Rio Grande rift system and the North Sea often contain a series of half-graben sub-basins, with the polarity of the dominant fault system ...

8. Canadian Arctic Rift System - Wikipedia

   en.wikipedia.org/wiki/Canadian_Arctic_Rift_System

   The Canadian Arctic Rift System is a branch of the Mid-Atlantic Ridge that extends 4,800 km (3,000 mi) into the North American continent. It is an incipient structure that diminishes in degree of development northwestward, bifurcates at the head of Baffin Bay and disappears into the Arctic Archipelago.

9. Rift Valley lakes - Wikipedia

   en.wikipedia.org/wiki/Rift_Valley_lakes

   The Southern Rift Valley lakes are like the Western Rift Valley lakes in that, with one exception, they are freshwater lakes. Lake Rukwa (about 5,670 square kilometres (2,190 sq mi) but quite variable) in Tanzania is the alkaline exception, lying south-east of Tanganyika, and has no outlet.