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.
Why do warm ocean currents cool as they flow along a coastline away from the equator? Warm ocean currents cool as they flow along a coastline away from  the equator because sand and minerals are transported by ocean  currents away from the equator. Making the world better, one answer at a time.