Multiple Choice: Geological Features of the Sahara

Pick the feature is described in the question

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Last updated: April 11, 2024

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First submitted	April 11, 2024
Times taken	8
Average score	80.0%
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1. The site of a large amount of fossil water (water that hasn't been disturbed in thousands of years), part of which is diverted into Libya's Great Manmade River.

Great Sand Sea ✓

Nubian Sandstone Aquifer ✓

Lake Chad ✓

Nile River ✓

2. This feature is characterized by wide, shallow valleys strewn with granite blocks. It is the burial site of the Asseler Man, and the site of a series of mosques that all run north to south and have multiple aisles parallel to the qibla.

Hoggar Mountains ✓

Atlas Mountains ✓

Air Mountains ✓

Adrar del Ifoghas ✓

3. A predictably flooding body of water that flows from Ethiopia to the Mediterranean, the site of the Ancient Egyptian civilization and the home of 20% of the African population.

Nile River ✓

Lake Chad ✓

Great Sand Sea ✓

Nubian Sandstone Aquifer ✓

4. This feature boasts a Sahel climate, strangely dark granite, uranium, coal, and one of the largest ring dyke systems in the world. It is the site of large prehistoric petroglyphs of giraffes.

Air Mountains ✓

Tibesti Mountains ✓

Richat Structure ✓

Nubian Sandstone Aquifer ✓

5. The remnants of a gigantic paleolake, housed in a rift basin with normal faults on both sides and a graben in the middle. Critically threatened by climate change

Nubian Sandstone Aquifer ✓

Nile River ✓

Great Sand Sea ✓

Lake Chad ✓

6. Contains the tomb of Tin Hanan, a fugitive princess whose caravan became the first Tuaregs, and whose existence was thought to be a legend until the tomb was found. This feature's tallest peaks have been eroded down to the igneous rock that used to plug the volcanos. It also had some of the last holdouts of the Northwest African Cheetah, which can survive drinking only blood and no water.

Richat Structure ✓

Tibesti Mountains ✓

Hoggar Mountains ✓

Air Mountains ✓

7. Part of this feature formed when Africa collided with North America and created what are now the Fall Line Escarpment and Appalachian Mountains in the Eastern USA. The larger part formed when Africa collided with Europe and uplifted this feature along with the Alps and Pyrenees. This mysterious feature is bigger than expected when the crust is not particularly thick or shortened. Anomalies in the mantle are suspected.

Atlas Mountains ✓

Richat Structure ✓

Adrar del Ifoghas ✓

Red Sea Hills ✓

8. An eroded dome with two concentric ring dykes that conspiracy theorists consider the site of Atlantis. It has a few stone tool artifacts that have been brought closer together by deflation of the dome.

Nile River ✓

Adrar del Ifoghas ✓

Richat Structure ✓

Hoggar Mountains ✓

9. Long sand ridges running north-south, featured in Assassin's Creed

Great Sand Sea ✓

Adrar del Ifoghas ✓

Red Sea Hills ✓

Tibesti Mountains ✓

10. A recently active volcanic area with sulfurous fumaroles, hot springs, and mud pools. Surrounded by plateaus created by old lava flows. Water collects in this relatively cooler area, and flows to Lake Chad through rivers (though evaporation is an issue) and underground aquifers. The soil alternates between sand/gravel and silt/clay, indicating that the climate alternates between dry (little erosion) and wet (water erosion).

Tibesti Mountains ✓

Air Mountains ✓

Great Sand Sea ✓

Richat Structure ✓

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