Quotation marks, also called 'inverted commas', are of two types: single and double. British practice is normally to enclose quoted matter between single quotation marks, and to use double quotation marks for a quotation within a quotation:
The oceans absorb the sun's heat, transferring it to the atmosphere and distributing it around the world via the ever-moving ocean currents. This drives global weather patterns and acts as a heater in the winter and an air conditioner in the summer.
Ocean currents play a critical role in climate and marine ecology. Upwelling areas are particularly important in both processes. Here we will examine what ocean upwelling is, how it works, some examples, and will finish with a brief quiz. Earth Science 102: Weather and Climate / Science Courses