10 most difficult geology riddles A list of ten (out of 34) geology related questions that are the most often answered incorrectly Geology quiz Caspian Sea, the biggest lake on Earth was earlier:An ocean. Caspian Sea among with Mediterranean Sea and Black Sea are remnants of Tethys Ocean that once separated Asia and Africa. 5.5 mln years ago it has been uplifted and separated from the rest of world ocean.very hard 16% a freshwater lakea freshwater lake23%a huge rivera huge river13%an open seaan open sea46%an oceanan ocean16%Created by: smyru. Statistics based on 400 answers in 2 languages »lakes riddles » 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.very hard 24% NamibNamib20%GobiGobi31%SaharaSahara24%MojaveMojave24%Created by: globalquiz.org. Statistics based on 7629 answers in 2 languages »deserts of Africa riddles » Gunung Mulu national park, a place with the most extensive cave system in the world, is located in which country?Malaysia. Gunung Mulu national park is located in the eastern province of Sarawak, Malaysia. It is located on Borneo, near the southern border of Brunei. Gunung Mulu National Park has the largest known natural chamber or room – Sarawak Chamber. It is 700 m (2,300 ft)) long, 396 m (1,299 ft) wide and at least 70 m (230 ft) highvery hard 28% MalaysiaMalaysia28%ThailandThailand24%CambodiaCambodia29%IndonesiaIndonesia17%Created by: Pranav Yalamanchili. Statistics based on 4392 answers in 4 languages »nature riddles » What is the most common element (by mass) forming the planet Earth?Iron is most abundant in the Earth's outer and inner core, and it is the fourth most common element in the Earth's crust.very hard 29% carboncarbon28%oxygenoxygen20%ironiron29%siliconsilicon20%Created by: globalquiz.org. Statistics based on 8950 answers in 2 languages »Earth riddles » This is Sable Island, known as the graveyard of the Atlantic. It is about 109 miles southeast of Nova Scotia. What is the island origin?Post-glacial. Sable Island is believed to have formed from a terminal moraine deposited on the continental shelf near the end of the last Ice Age. It emerges from vast shoals and shallows which, in tandem with frequent fog and sudden storms, have caused over 350 recorded shipwrecksvery hard 29% post-glacialpost-glacial29%coralcoral23%volcanicvolcanic19%it is the top of a drowned mountainit is the top of a drowned mountain27%Created by: globalquiz.org. Statistics based on 6370 answers in 2 languages »satellite photos riddles » Which volcano is known as being one of the most active, but at the same one of the least violent in the world?Kīlauea, Hawaii. Kīlauea is one of the most active volcanoes on the planet and an invaluable resource for volcanologists who are able to study it up close due to its exclusively non-violent effusive activity. Kīlauea lacks a distinct peak and lies close to Mauna Loa.very hard 37% Mt Etna, ItalyMt Etna, Italy21%Kīlauea, HawaiiKīlauea, Hawaii37%Eyjafjallajökull, IcelandEyjafjallajökull, Iceland32%Mt Pinatubo, PhilippinesMt Pinatubo, Philippines7%Created by: globalquiz.org. Statistics based on 10950 answers in 4 languages »Hawaii riddles » How is this narrow strip of land, attaching an island to the mainland, called?Tombolos are formed by wave refraction. As the waves near an island, they are slowed by the shallow water surrounding it. These waves then refract or "bend" around the island to the opposite side as they approach, sweeping sediment together from both sides.hard 40% skerryskerry26%sandiesandie27%tombolotombolo40%splitsplit4%Created by: Kasia. Statistics based on 11136 answers in 2 languages »seas riddles » What is the typical source of pressure buildup inside a volcano?Degassing of magma. The whole process begins when hot magma is lifted by convection to the magma chamber. As the pressure in the chamber is lower than deep in Earth's crust, the gas starts to release. Since degassed magma has lower density, it may then sink and be replaced with new one. This process may build up huge pressure of gases, eventually causing explosion.hard 40% centrifugal force of Earth rotationcentrifugal force of Earth rotation20%magma convectionmagma convection35%boiling of rainwaterboiling of rainwater3%degassing of magmadegassing of magma40%Created by: Sumit Tamang. Statistics based on 11657 answers in 2 languages »natural disasters riddles » Where is the famous Cave of the Crystals?In Mexico. The cave near Naica, Mexico, was discovered in 2000 by miners. At that time, it was completely submerged. Today, the cave is accessible because the mining company's pumping operations keep it clear of water. Unfortunately, the crystals deteriorate in air, and soon may be lost.hard 40% in Switzerlandin Switzerland15%in USAin USA12%in Mexicoin Mexico40%in South Africain South Africa30%Created by: globalquiz.org. Statistics based on 13907 answers in 4 languages »geography of Mexico riddles » How old is Baltic Sea?12 000 years old. Baltic Sea is one of the youngest seas in the world. It was formed after the last ice age as ice-lake, which later turned into a sea.hard 40% 1200 years old1200 years old5%12 000 years old12 000 years old40%120 000 years old120 000 years old32%12 000 000 years old12 000 000 years old21%Created by: KYRTAPS. Statistics based on 14510 answers in 4 languages »water riddles » Play geology quiz and see all the questions.