questionedithistorytranslationsWhich Greek letter is used to describe a type of river mouth?sigma1292alpha770delta17642gamma472Delta looks like Greek letter Δ. It is formed when deposition of sediment is more intensive than sea erosion.Share and bring new players to the game!correct this questionKYRTAPSreach: rather globalgeographygeologyriverswaterSimon Ledinghamwikipedia → River deltaWater quizGeology quizRivers quizGeography quizWhich of the following European mountain ranges will rise the most in the next century?Scandinavian Mountains. The whole Scandinavia experiences uplift as a result of post-glacial rebound. In northern Europe, this is clearly shown by the GPS data obtained by the BIFROST GPS network. The average uplift is less than 1cm/year, but it may accumulate to 400m during next 10,000 years.Which desert has this famous "eye"?Sahara. The Richat Structure in Mauritania, also known as the Eye of the Sahara, was interpreted as an asteroid impact structure, but no evidence for shock metamorphism has been found. Today scientists believe that it is a huge (40 km in diameter) and deeply eroded geologic dome.What is the maximum depth of permafrost?1500 m. In areas of harsh winters the depth of the permafrost can be as much as 1,493 m (4,898 ft) in the northern Lena and Yana River basins. The overlying active layer that seasonally thaws is just 0.6–4 m (2.0–13 ft) thick.What is the largest lake in the world?Caspian Sea. In the past, Caspian Sea was a part of Tethys Ocean. It became landlocked about 5.5 million years ago due to tectonic uplift and a fall in sea level. With the total area of 370 000 square km, the lake is larger than Germany.