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he lay on his back , back / bak/ • n. 1. the rear surface of the human body from the shoulders to the hips: he lay on his back ∎ the corresponding upper surface of an ani… Backing , backing •backing, blacking, packing, sacking, tracking, whacking •ranking, spanking •nerve-racking •marking, sarking •making, taking, undertaking •ma… Backpack , back·pack / ˈbakˌpak/ • n. a bag, often supported by a metal frame, with shoulder straps that allow it to be carried on someone's back. ∎ a knapsack… humpback , hump·back / ˈhəmpˌbak/ • n. 1. (also humpback whale) a baleen whale (Megaptera novaeangliae) that has a hump (instead of a dorsal fin) and long white… Rip Current , Rip current
A rip current is a narrow, river-like channel of water moving away from the surf (breaking) zone and back toward sea. Rip currents can tr… Boundary Current , boundary current The northward- or southward-directed ocean-water current which flows parallel and close to a continental margin. Such currents are c…
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