The most difficult natural disasters riddles A list of natural disasters related questions that are most often answered incorrectly Geography quiz 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 11854 answers in 2 languages »disasters riddles » Which asteroid will approach dangerously close to Earth in 2029 and 2036? (99942) Apophis. On April 13, 2029, Apophis will pass Earth within the orbits of geosynchronous communication satellites, but will come no closer than 19,400 miles (31,200 km) above Earth's surface. The 2029 pass will be much closer than had first been predicted. The pass in late March 2036 will be no closer than about 23 million kilometres (14×106 mi)—and will most likely miss Earth by something closer to 56 million kilometreshard 40% (99942) Apophis(99942) Apophis40%(163693) Atira(163693) Atira17%(434326) 2004 JG6(434326) 2004 JG626%(1981) Midas(1981) Midas15%Created by: StrikeWhistler. Statistics based on 2874 answers in 2 languages »Solar System riddles » Which continent has the least active volcanoes?Australia. There are no active volcanoes on the Australian mainland that have erupted since European settlement, however some volcanoes in Victoria and South Australia are likely to have been active and witnessed by Aboriginal people several thousand years ago.average 60% EuropeEurope17%North AmericaNorth America7%AfricaAfrica14%AustraliaAustralia60%Created by: globalquiz.org. Statistics based on 26112 answers in 2 languages »geography of Australia riddles » In which major European city there is a volcano that may soon erupt?In Naples. Lying mostly underwater, Campi Flegrei comprises 24 craters. It is one of the largest volcanoes in the world, capable of producing VEI 7 (super-colossal) eruptions. Its most recent eruption of 1538 created a new hill, Monte Nuovo.average 69% in Portoin Porto3%in Heraklionin Heraklion9%in Naplesin Naples69%in Palermoin Palermo16%Created by: Hitter smasher. Statistics based on 34218 answers in 4 languages »geography of Italy riddles » Which European capital was hit by a major earthquake in 1977?Bucharest. At 21:22, on the evening of March 4, 1977, Bucharest was hit by an earthquake measuring a whopping 7.3 on the Richter scale. The city center suffered significant damage and many historic buildings were destroyed. The earthquake killed about 1,578 people in Romania (1,424 in Bucharest), and wounded more than 11,300.easy 78% BucharestBucharest78%ViennaVienna11%PraguePrague7%WarsawWarsaw2%Created by: Monica Stiller. Statistics based on 8924 answers in 4 languages »Romania riddles » Play geography quiz and see all the questions.