abyssal plain: translation large, relatively flat areas of ocean floor found at 5,000-6,000m below sea level. If sediments are discharged from a river... смотреть
abyssal plain: translationthe area of the generally flat ocean floor excluding ocean trenches below 2000 fathoms (3660 metres, presumably an older vers... смотреть
<geogr.> дно абиссальное
абиссальная равнина
геогр. абиссальное дно