Jämför länder | Världskoll Här kan du se hur stor yta varje person i landet har. Källa Här kan du se hur stor andel av världens internetanvändare som finns i landet. Eftersom siffran beräknas utifrån hela världen så kan små länder få en ganska liten andel även om nästan alla i landet är uppkopplade. Källa Trots att väldigt många använder internet i Sverige står svenskar inte ens för en halv procent av allt surfande i världen! Här kan du se hur mycket befolkningen växer eller minskar i procent under ett år. Källa Här kan du se medellivslängden i landet. Källa Medellivslängden i Sverige är bland de högsta i världen! Källa Här kan du se hur många procent av landets befolkning som kommer att dö i år. Källa 2011 slutade Sverige att ge bistånd till Nicaragua, då hade vi gett bistånd till landet i nästan 30 år. 2011 slutade Sverige att ge bistånd till Nicaragua, då hade vi gett bistånd till landet i nästan 30 år. Källa Här kan du se hur många år en person som växer upp i landet förväntas gå i skolan. Källa Källa Källa Källa källa
The Griffin and the Dinosaur The Water Cycle for Schools The water cycle describes how Earth's water is not only always changing forms, between liquid (rain), solid (ice), and gas (vapor), but also moving on, above, and in the Earth. This process is always happening everywhere. Back to the water cycle diagram for students. Condensation The colder temperatures high in the atmosphere cause the water vapor to turn back into tiny liquid water droplets—the clouds. This is condensation, the opposite of evaporation. Evaporation The sun causes liquid water to evaporate, or turn from a liquid to a gas (water vapor). Most evaporation happens from the oceans, since oceans cover 70% of the Earth's surface. Groundwater Lots of water exists in the ground below your feet. Some precipitation and runoff soaks into the ground to become groundwater. Precipitation The tiny cloud droplets combine with each other and grow into bigger water drops. When they get heavy enough, they fall to Earth as precipitation, such as rain and snow. Runoff The Sun
USGS - Irrigation Water Use Think of what your supper table might be like if water was not used to irrigate crops. Do you think you could survive very long without heaping servings of eggplant, beets, brussels sprouts, and rutabagas? Irrigation water is essential for keeping fruits, vegetables, and grains growing to feed the world's population, and this has been a constant for thousands of years. Throughout the world, irrigation (water for agriculture, or growing crops) is probably the most important use of water (except for drinking and washing a smelly dog, perhaps). Estimates vary, but about 70 percent of all the world's freshwater withdrawals go towards irrigation uses ( Center-pivot irrigation circles, Finney County, Kansas. View full size Irrigation has been around for as long as humans have been cultivating plants. Irrigation water withdrawals for the Nation, 2005 Irrigation water withdrawals, by State, 2005 Irrigation water use, 2000
Afghanistan fights population growth with birth control Drinking Water That Dinosaurs Drank? - Science Questions, from the Naked Scientists Listen Now Download as mp3 from the show Naked Science Questions and Answers Question Skye, Arkensaw asked: I was taught when I was young that we drink the same water today that the dinosaurs drank when they were alive, is that true? Answer Professor Ken Carslaw, Atmospheric Science, University of Leeds: Water is recycled through the water cycle. Multimedia Subscribe Free Related Content Comments mod edit - tweaked a little - I'm sure Dr Beaver can see why! beaver edit - OI.. stop fiddling with my bits! If you go one further and consider /proton/ exchange, essentially the autoionization process that occurs in any water sample and gives neutral water a pH of 7 (3O+] = 10-7 M) but involves no change in the oxidation state of the atoms, it is even more unlikely that any individual water molecules have survived for 65 million years. btw, I will certainly assign this as a homework problem in kinetics this fall! Chris Looking at the figures given by Dr. 100 x (12 x 1012/1.4 x 1021) or 8.57 x 10 -7%
Activity 4 Teacher Guide: The Water Cycle In this activity, students will build a model to simulate parts of the water cycle. They will be able to recognize and explain the essential elements of the water cycle. Background Water, in its different forms, cycles continuously through the lithosphere, hydrosphere, atmosphere, and biosphere. Water evaporates into the atmosphere from the land and the sea. As far as we know, earth is the only planet with water in three phases: solid, liquid, and gas. Water is essential for life on earth. Through these processes, the amount of water on earth remains nearly constant and is continually recycled through time. Learning Goals Students will appreciate that scale models can be an important tool to use to help understand global processes. Alignment to National Standards National Science Education Standards Benchmarks for Science Literacy, Project 2061, AAAS Grade Level/Time Materials Artist's clay or plastic mountain model Plastic shoe box with cover Petri dish Lamp Water Crushed ice Procedure
Irrigation Systems The hub of a center-pivot irrigation system Irrigation systems are also used for cooling livestock, dust suppression, disposal of sewage, and in mining. Irrigation is often studied together with drainage, which is the removal of surface and sub-surface water from a given area. Irrigation has been a central feature of agriculture for over 5,000 years and is the product of many cultures. History[edit] Animal-powered irrigation, Upper Egypt, ca. 1846 Archaeological investigation has found evidence of irrigation in areas lacking sufficient natural rainfall to support crops for rainfed agriculture. Farmers in the Mesopotamian plain used irrigation from at least the third millennium BCE.[8] They developed perennial irrigation, regularly watering crops throughout the growing season by coaxing water through a matrix of small channels formed in the field.[9]Ancient Egyptians practiced basin irrigation using the flooding of the Nile to inundate land plots which had been surrounded by dykes.
Krafter - Fysik 1 - Sammanfattning - Kurshjälpen - StuderaSmart Ordet kraft har du säkert hört hur många gånger som helst. Men vad är krafter egentligen? Krafter är ett begrepp som används i många sammanhang. För att demonstrera vad en kraft är kan du prova att lyfta din penna. Jämför hur jobbigt detta är med att lyfta en femkilosvikt. Det är ju jobbigare att lyfta femkilosvikten för att den har en större tyngd. Alla föremål på jorden har en massa och en tyngd(vi ska senare se skillnaden mellan dessa begrepp). Vi kommer senare att se att tyngdkraften på ett föremål är proportionell mot föremålets massa. För att lyfta ett föremål med massa krävs en kraft. Några andra exempel på krafter är: MuskelkraftNormalkraftFriktionskraftElektrisk kraftMagnetisk kraft Kraft mäts i enheten Newton och storleken på kraften mäts med en dynamometer. Kraft är en vektorstorhet vilket betyder att den både har storlek och riktning. En kraft kan, som vi sade tidigare, bland annat få ett föremål att röra sig eller lyftas. Normalkraften brukar betecknas FN. Tips! g=9,82 N/kg Exempel
Dammed Indians Revisited: The Continuing History of the Pick-Sloan Plan and the Missouri River Sioux Cloud Seeding - Frequently Asked Questions References 1. Dennis, A.S. , 1980: Weather Modification by Cloud Seeding. Academic Press, New York. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. The Weather Modification Association (WMA) has produced a basic informational booklet, Weather Modification: Some Facts About Seeding Clouds. For those wishing to investigate the possibility of developing and implementing a specific project, we recommend that you contact us, North American Weather Consultants, an industry pioneer and leader since 1950, to discuss your cloud seeding needs and interests.
Water, Water Everywhere! Overview During this unit, students will write about how the same water has been reused for millions of years while describing the roles precipitation, evaporation, and condensation play in the water cycle. Each student will build a 3-D cloud that includes a labeled diagram of the water cycle, ten important facts about water, the definitions of eight water words, and a writing piece they publish describing how the water cycle works. Objective Students will: Understand how the same water has been used over and over again through the water cycle Develop a list of ten important facts about water Define and use words associated with the water cycle Write a summary of how the water cycle functions Follow step-by-step directions to create a three-dimensional cloud with several components Lesson Plans for this Unit Culminating Activity After students have assembled their clouds, hang them around the classroom and hallways for all to enjoy. false Dec 31, 1969 Published