Вопрос № 236869 - Английский язык

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The slowest aircraft are helicopters, which can hover in the air without moving. Aircraft with wings have to fly above a certain speed, otherwise they will crash. However, pedal-powered aircraft flew across the English Channel for the first time. Its average speed was 8 miles an hour – or faster than you can run!

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 _____ is a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return.

_____ pressure is called the force per unit area exerted by an atmospheric column.

Cartography is the art and science of graphically representing a _____ area, usually on a flat surface such as a map or chart.

_____ is a complex concept involving data on weather conditions and phenomena and the relationships among them.

Climate _____ is an attempt to formalize the process of recognizing climatic similarity and of systematizing the effects of interacting climatic processes.