d라이브러리
"water"(으)로 총 148건 검색되었습니다.
- 식어가는 온천과학동아 l1991년 10호
- geothermal energy and fossil fuel reservoirs. The deposits formed between 15 million and 18 million years ago, when seawater was trapped in porous beds of sandstone between impermeable clay lay ...
- 화산과학동아 l1991년 09호
- the volcano from ever erupting again. This, however, is a matter of false confidence. Somewhere deep in the Earth, water is collecting and being converted into steam by the internal heat of the ...
- 우리의 조상인 실러캔스과학동아 l1991년 08호
- known.Lungfish have primitive lungs and can, and do, gulp air when necessary. They can manage to get out of brackish water and make their way to larger pools.When this is not possible, especial ...
- 찾기 힘든 쿼크를 찾아서과학동아 l1991년 07호
- Trondheim, are searching for quarks, the fundamental particles that make up matter.Ordinary matter is not very dense. Water, for instance, has a density of one gram per cubic centimeter. That i ...
- 가장 깊은 호수과학동아 l1991년 07호
- and animals that are peculiar to it. There are over 1,200 different species that live at different levels in the water and, of these, some three-fourths are not found anywhere else.The largest ...
- 줄어드는 삼각주과학동아 l1991년 02호
- and farming in the Nile delta.But now the delta has fallen on evil times. The Aswan dam, built in 1964 to control the water supply, has cut down on the amount of silt that reaches the delta. Th ...
- 일본의 기술과학동아 l1991년 01호
- Canal, which can serve as a land bridge between the Atlantic and Pacific Oceans.They dream also of ways in which water can be brought to the deserts, and taken away from the flood plains of Ind ...
- 외래해충에 파괴되는 생태계과학동아 l1990년 11호
- 위해 도시의 가로수에 수없이 많은 농약을 살포해야만 했다.■벼물바구미(Rice water weevil)최근에 우리나라에 유입된 벼의 해충이다. 바구미란 이름은 주둥이가 앞으로 길게 뻗은 독특한 모양에서 붙여진 것으로 딱정벌레무리에 속하는 해충이다.벼물바구미는 북미대륙이 원산으로 원래벼과 잡초를 ... ...
- 금이 없다!과학동아 l1990년 11호
- anywhere-not nearly as high as was thought.Of course, we must remember that the ocean is vast. The total amount of seawater on Earth weighs about 1.4 million trillion tons. Even if there is onl ...
- 발 달린 고래과학동아 l1990년 10호
- are dimmest. They were once land mammals that returned to the sea 50 million years ago and are now the best adapted to water life of all mammals. Cetaceans developed a streamlined fish-like sha ...
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