Geology questions This is a list of recently added questions about geology. Play geology quiz and see all the questions. When did the course of the Baltic Sea coastline finally form?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. Created by: Tschuka very hard 23% about 5,000 years agoabout 5,000 years ago44about 10,000 years agoabout 10,000 years ago121about 3,500 years agoabout 3,500 years ago78about 2,000 years agoabout 2,000 years ago73geography of Europe riddles » What is the rarest metal in the Earth's crust?Rhenium is a chemical element with symbol Re It is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. With an estimated average concentration of 1 part per billion (ppb), rhenium is one of the rarest elements in the Earth's crust. Discovered in 1908, rhenium was the second-last stable element to be discovered. It was named after the river Rhine in Europe. Created by: Tschuka hard 42% GoldGold284RheniumRhenium1471PlatinumPlatinum992ZirconiumZirconium750Earth riddles » What is the half-time of radiocarbon? (carbon-14)5730 years. Carbon-14, 14C, or radiocarbon, is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons. Carbon-12 and carbon-13 are both stable, while the half-life of carbon-14 is 5,730 ±40 years. Created by: Tschuka hard 49% 5 years5 years28557 years57 years662573 years573 years5595730 years5730 years1482chemical elements riddles » Sapphire is a blue variety:Of corundum. Sapphire is a gemstone, a variety of the mineral corundum, an aluminium. It is typically blue in color, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colors. Pink colored corundum may be either classified as ruby or sapphire depending on locale.Created by: Tschuka very hard 31% of agateof agate228of chalcedonyof chalcedony153of corundumof corundum231of jasperof jasper126minerals riddles » In moderate and cold climates, a tree gains one ring every year, which allows us to estimate its age. Where else we can estimate age in similar fashion?At the bottom of the lake, sedimentation. A the bottom of some lakes the sediments stay very well preserved. Lamina lucida and lamina densa are created during the one year cycle. This fact can be used as lake's age estimation.Created by: Ninjaihard 50% on the beach, layers of sand and griton the beach, layers of sand and grit624at the bottom of the lake, sedimentationat the bottom of the lake, sedimentation5454in the craters, pyroclastic rocksin the craters, pyroclastic rocks2008in the glaciers, layers of clay and sandin the glaciers, layers of clay and sand2760lakes riddles » What is karst?A kind of chemical decomposition. Karst is a topography formed from the dissolution of soluble rocks such as limestone, dolomite, and gypsum. It is characterized by underground drainage systems with sinkholes and caves. It has also been documented for more weathering-resistant rocks, such as quartzite, given the right conditions.Created by: Ninjaihard 44% a kind of physical decompositiona kind of physical decomposition4012a kind of chemical decompositiona kind of chemical decomposition6905a kind of biological decompositiona kind of biological decomposition2093none of the abovenone of the above2448caves riddles » How much did the biggest gold nugget weigh?235 kg. Record big nugget was found in Australia in 1872. It weighed 7555.42 oz that is 235 kg and measured 1.42 m.Created by: smyruhard 43% 2,35 kg2,35 kg83223,5 kg23,5 kg1650235 kg235 kg22072350 kg2350 kg442metals riddles » When did the dinosaurs first appeared on Earth?About 230 million years ago. The oldest known findings of dinosaurs are about 230 million years old. Paleontologists think that the early dinosaur genus Eoraptor resembles the common ancestor of all dinosaurs; if this is true, its traits suggest that the first dinosaurs were small, bipedal predators.Created by: smyruhard 48% about 10 million years agoabout 10 million years ago358about 70 million years agoabout 70 million years ago530about 230 million years agoabout 230 million years ago1948about 600 million years agoabout 600 million years ago1208animals riddles » What is the name of this periglacial landform largely spread in the Mackenzie Delta ?Pingos are dome-shaped, isolated hills (also called hydrolaccoliths) , formed by ice cores that pushed the permafrost upwards. Collapsed pingos suggests that there was once permafrost in the area. They can be found in north Canada, Alaska, Greenland and Siberia.Created by: Mag Adihard 42% PingoPingo2564Roche MoutonneeRoche Moutonnee1282Mud VolcanoMud Volcano1453ErraticErratic672Alaska riddles » What is the main difference between a zeuge and an yardang ?Yardangs are formed on vertical strata while zeugen on horizontal strata. Yardangs are formed on vertical hard/soft layers of rock, while zeugen (this is its plural form) are formed on horizontal bands of hard/soft rocks giving it a more mushroom-like shape. The Great Sphinx of Giza has been sculpted in a yardang.Created by: Mag Adihard 48% The yardang is smaller than a zeuge.The yardang is smaller than a zeuge.15Yardangs are formed on vertical strata while zeugen on horizontal strata.Yardangs are formed on vertical strata while zeugen on horizontal strata.123Yardangs are formed by deflation while zeugen by abrasion.Yardangs are formed by deflation while zeugen by abrasion.81There is no difference. The two names describes the same landform.There is no difference. The two names describes the same landform.35 Play geology quiz and see all the questions.