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"earth"(으)로 총 187건 검색되었습니다.- 우주적 위험과학동아 199005
- Without cosmic rays, some think, evolution would be slowed to such an extent that even today there might be no life on Earth more advanced than bacteria.All this, though, depends on the protect ...
- 1990년대의 과학과학동아 199003
- be gained into the matter.But none of this is certain. It will all fail, for instance, if we continue to destroy the Earth through short-sighted mistreatment of the environment. Let's not do th ...
- 두 사람과학동아 199003
- 알 수가 없다.Two chief varieties of Homo sapiens have existed on Earth, and in December 1989, evidence was unearthed to indicate that the two might have coexisted for a while in Europe.The fi ...
- 화성을 다시 찾다과학동아 199002
- Iayer surface of Mars. A comet striking Mars, however, would plow up the Martian ground and send material streaking to Earth from farther down where the carbon-containing compounds may be conce ...
- 지구가 너무 덥고 추웠을 때 When The Earth Was Too Hot and Too Cold과학동아 199001
- out that these super-uncomfortable regions of Pangaea encompassed at least eight times the areas of such regions on Earth today.The places in Pangaea that would have been subjected to the highe ...
- 없앨 수 없는 것(플라스틱)과학동아 198912
- other forms of life, and once that is done, they re-enter the world of life. That is why life has been flourishing on Earth for eons.If, when things were used up, they were really used up and c ...
- 대 해빙과학동아 198912
- cover increases. As it does, more and more sunlight is reflected into space and does not have the chance to warm the Earth because snow is more reflective than bare ground is. Summers therefore ...
- 공룡의 죽음-열쇠가 되는 아미노산과학동아 198911
- is made up of one or more strings of anywhere from a dozen to several hundred amino acids. In general, amino acids on Earth are produced only by living tissue.In that case, there should be noth ...
- 20년후-달의 신비를 벗기며과학동아 198910
- relatively quiet-for Earth as well as the moon, for if the moon was bombarded, so was the Earth. It's just that on Earth the craters produced by that bombardment have worn away, t ...
- 녹색 식물의 탄생 How Green Plants Began?과학동아 198909
- complicated type that make up plants and animals formed about 1.4 billion years ago. By that time, though, the planet Earth had already existed for 3.2 billion years, so there was a long period ...
