@article{oai:sucra.repo.nii.ac.jp:00019261,
 author = {三上, 裕香 and 大塚, 裕加里 and エレデネ・, オチル・アリウンボヤン and 岡本, 和明},
 issue = {1},
 journal = {埼玉大学紀要. 教育学部, Journal of Saitama University. Faculty of Education},
 month = {},
 note = {This paper reports how to educate river characteristics, flood disasters and blessings from nature in online-geoscience-class. Japanese Islands are characterized by rivers which flows from high mountains to the river-mouth with steep streams, and suffers floods caused by heavy rains. Therefore, river educations are important in science class at school. It is required to learn water flow and river from 4th to 6th grades in Japanese primary school. However, field observation of rivers is limited in nearby area from school. It is necessary to observe from head stream in steep mountain, to river mouth in bay area. Online experimental class is quite useful and powerful tool to teach the essence of river to school children. Based on courses of study (determined by Ministry of Education, Culture, Sports, Science and Technology, Japan), we propose online experimental classes for river as follows.
1)birds-eye-view observation using satellite image in google earth, and video learning program(NHK for school, rika)
2)updated geo-hazard map (geographic information system map- natural disasters caused by rivers)
3)demonstrating simple boiling experiments using hard water and soft water how to make tasty Japanese and European dashi (soup stock).
In the 3), we used kelp and pork with the mineral water (hard water and soft water). The soft water is dominant as Japanese mineral water, especially in Kansai region. Because the soft water does not contain enough calcium to rid soup of the harshness caused by animal meat, dashi (e.g. kelp stock) plays significant role in washoku (Japanese cuisine). Besides, the soft water extracts umami whereas certain amount of minerals in the hard water seal the surface the umami gradients. On the other hand, strong smell of meat and poultry can be removed as scum when boiled in the hard water. Therefore, pork soup stock is better for the hard water. Thus, the dashi (kelp stock) is blessing from Japanese soft water from rivers., text, application/pdf},
 pages = {187--199},
 title = {科学力育成のための地学オンライン実験 : 河川の特徴、災害と自然の恵み<数学・自然科学>},
 volume = {70},
 year = {2021},
 yomi = {ミカミ, ユカ and オオツカ, ユカリ and エレデネ, オチル アリウンボヤン and オカモト, カズアキ}
}