Water questions This is a list of recently added questions about water. Play water quiz and see all the questions. Chemical formula of hydrogen peroxide is ...H₂O₂. Hydrogen peroxide is the simplest peroxide. In its pure form, it is a colourless liquid, slightly more viscous than water. It was first obtained by Louis Thénard in 1818 in the reaction of barium peroxide with nitric acid.Created by: Katarzyna Dąbrowskavery easy 87% CO₂CO₂83H₂O₂H₂O₂2561CH₄CH₄188H₂O₄H₂O₄90medicine riddles » How is the soilless cultivation of plants called?Hydroponics is a subset of hydroculture and is a method of growing plants using mineral nutrient solutions, in water, without soil. Terrestrial plants may be grown with their roots in the mineral nutrient solution only or in an inert medium, such as perlite or gravel.Created by: Paweł Kołodziejczykhard 50% hydrologyhydrology1577hydroculturehydroculture3223hydroponicshydroponics8733hydrofarminghydrofarming3713crops riddles » What part of the Earth's surface is dry land?29,2%. It is currenlty 29.2% - but it may decrease in the near future due to global warming and sea level rise.Created by: Krzysztof Moskalhard 54% 29,2%29,2%380933,6%33,6%196238,4%38,4%78242,1%42,1%410Earth riddles » In which country is the Plitvice Lakes National Park located?In Croatia. Plitvice Lakes National Park is a national park in Croatia. Since 1979 it is on a list of the UNESCO World Heritage list. The park consists of the system of 16 lakes connected by numerous waterfalls and cascades.Created by: Paweł Kołodziejczykhard 55% In the Czech RepublicIn the Czech Republic1922In SlovakiaIn Slovakia2812In CroatiaIn Croatia6890In HungaryIn Hungary851lakes riddles » How many players of one team are there in a pool during the water polo game?7. A team consists of 6 field players and one goalkeeper in the water at any one time. Created by: Paweł Kołodziejczykhard 52% 553383775080998461111391numbers riddles » What is the name of the line on the map which joins points of equal rainfall?Isyhyet joins points where the amount of precipitation (rainfall, snow etc) is the same. Created by: Paweł Kołodziejczykhard 40% IsohigraIsohigra1012IsohydraIsohydra4528IydroizohipsaIydroizohipsa1286IsyhyetIsyhyet4681meteorology riddles » Which place in the world has the highest average annual precipitation? Southern foothills of the Himalayas. Mawsynram village in northeast India has the highest average annual total percipitation in the world (11,872 mm = 467.4 in). There, hot and moist air from south of India approaches Himalayas. It rises up, cools and loses water.Created by: KYRTAPSvery hard 29% North-west ScotlandNorth-west Scotland603Central Amazon BasinCentral Amazon Basin3087Tuvalu IslandsTuvalu Islands478Southern foothills of the HimalayasSouthern foothills of the Himalayas1733geography riddles » Which Greek letter is used to describe a type of river mouth?Delta looks like Greek letter Δ. It is formed when deposition of sediment is more intensive than sea erosion.Created by: KYRTAPSvery easy 87% sigmasigma1102alphaalpha652deltadelta15218gammagamma404geology 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.Created by: KYRTAPShard 40% 1200 years old1200 years old73412 000 years old12 000 years old5377120 000 years old120 000 years old432312 000 000 years old12 000 000 years old2837seas riddles » What does the color range represent in this picture?Water salinity. Launched June 10, 2011, Aquarius is NASA’s first satellite instrument specifically designed to study the salt content of ocean surface waters. The complete first year dataset of NASA's Aquarius instrument reveals seasonal changes in the Amazon River's plume. Depending on the prevailing currents, the river's freshwater outflow heads east toward Africa or bends up north to the Caribbean.Created by: globalquiz.orgvery hard 38% water temperaturewater temperature4629sea currents speedsea currents speed1783water salinitywater salinity5219sea depthsea depth1990satellite photography riddles » Play water quiz and see all the questions.