Meteorologists want to design a system of instruments that will evaluate ocean currents, air temperatures, and wind speed in order to predict catastrophic weather such as hurricanes and cyclones. Before building a working system of the weather instruments, the scientists have built a prototype. Using their prototype, they have collected data and used that data to help predict changes in the weather. Finally, using the data collected, they have decided that the system of instruments works well to predict upcoming catastrophic weather events. The next step would be to A) modify the design of their prototype. B) build the system of weather instruments. C) change their basic ideas concerning the instruments. D) use the data to evaluate the effectiveness of the prototype.

An ocean current is a continuous, directed movement of sea water generated by a number of forces acting upon the water, including wind, the Coriolis effect, breaking waves and temperature and salinity differences.

To measure ocean currents, you need three basic tools- an observer, a floating object or a drifter and a timing device. At NOAA, oceanographers use knots to measure current speed. The term knot is defined as one nautical mile per hour.

The correct answer is option D.

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