The sun heats the earth, but unevenly. The excess heat around the equator moves towards the poles, via a number of different mechanisms, the most noticeable for us humans being via air masses. That's what much of our weather is about. Heat also moves towards the poles, in the ongoing...
The first global map of the salinity, or saltiness, of Earth's ocean surface produced by NASA's new Aquarius instrument reveals a rich tapestry of global salinity patterns, demonstrating Aquarius' ability to resolve large-scale salinity distribution features clearly and with sharp contrast...