10 most difficult geology riddlesGeology quiz
Which desert has this famous "eye"?
The Richat Structure in Mauritania, also known as the Eye of the Sahara, was interpreted as an asteroid impact structure, but no evidence of shock metamorphism has been found. Today, scientists believe that it is a huge (40 km in diameter) and deeply eroded geologic dome.
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?
it is the top of a drowned mountain
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 shipwrecks
Gunung Mulu national park, a place with the most extensive cave system in the world, is located in which country?
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) high
When did the course of the Baltic Sea coastline finally form?
about 5,000 years ago
about 10,000 years ago
about 3,500 years ago
about 2,000 years ago
The Baltic Sea is one of the largest brackish inland seas by area, and occupies a basin formed by glacial erosion during the last few ice ages. It is about 1,600 km (990 mi) long, an average of 193 km (120 mi) wide, and an average of 55 metres (180 ft) deep. The maximum depth is 459 m (1,506 ft).The current course of the shoreline was formed about 2 thousand years ago.
Where is the longest cave in Europe located?
Optymistychna Cave (Ukrainian meaning "optimistic") is a gypsum cave located near the Ukrainian village of Korolivka. Approximately 230 km of passageways have been mapped within. As a result, it is the longest cave in Eurasia, the fifth-longest cave in the world and the longest gypsum cave in the world.
What 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.
Which volcano is known as being one of the most active, but at the same one of the least violent in the world?
Mt Etna, Italy
Mt Pinatubo, Philippines
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.
What is the typical source of pressure buildup inside a volcano?
centrifugal force of Earth rotation
boiling of rainwater
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.