d라이브러리
"Rock"(으)로 총 47건 검색되었습니다.
- 핵폐기물 처리 완벽한 기술 아직 없다과학동아 l199012
- 방법은 육지처분이다. 이 방법에는 천부(淺部)처분(shallow ground disposal) 공동(空洞)처분(rock cavity disposal) 지하심층처분(underground geological disposal) 세가지가 있다.천부처분은 참호나 도랑(trench)을 파고 폐기물을 묻고 흙을 덮는 방식과 지상에 처분하고 흙을 덮는 방식이 ...
- 보이지 않았던 별과학동아 l199009
- some people to believe that sighting along certain stones located the rising sun on the day of summer solstice. The rock arrangements may have served as a Stone Age observatory capable of predi ...
- 상처를 찾아라과학동아 l199008
- but there are other possible sources for the iridium, too. A period of vast volcanic activity may have brought up rock from Earth's interior, which is also richer in iridium than the crust is. ...
- 박테리아 광부들과학동아 l199008
- used that could be found in free form -- gold, silver, copper and meteoric iron. When it was discovered that certain rocky 'ores' could be heated and smelted, and force to yield metals, that in ...
- 우주적 위험과학동아 l199005
- material from the moon could be compacted and layered on the outside of space vessels, giving them the protection of rock, though I don't know if that, too, could be saturated by cosmic rays.On ...
- 화성을 다시 찾다과학동아 l199002
- but remain exactly as they were when they landed.A few of the meteorites have the same composition as do the Moon rocks brought back by the astronauts. The feeling is that the bombardment of th ...
- 대 해빙과학동아 l198912
- water might have slowly settled down to the bottom of the ice-sheet, soaked into the ground till it reached bed-rock, and then slowly accumulated there. There would thus form what was essentia ...
- 20년후-달의 신비를 벗기며과학동아 l198910
- existed in its vicinity. These formed the numerous craters and the vast "seas" that now cover its surface. From the rocks we have brought back, we can study the different stages of that bombard ...
- 소행성의 근접신호과학동아 l198908
- miles, about twice the distance from the Earth to the moon. That sounds like a safe distance, of course.However, that rock is following an orbit that nearly crosses Earth's and every once in a ...
- 대기권 밖의 망원경과학동아 l198904
- twinkle, and blurring what we see. None of that will interfere with the Hubble space telescope. It will see everything rock-steady and point-sharp.What it amounts to, then, is that the telescop ...
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