The water flowing in a stream or river is fed by numerous smaller streams, which are fed by even smaller streams that collect water from melting snow or ice up in the mountains, from springs, and possibly from human wasterwater sources. The bottoms of rivers are also below the water table in many places, so there will always be water at that level.
For much of the last quarter century, the leading theory of the driving force behind tectonic plate motions envisaged large scale convection currents in the upper mantle, which can be transmitted through the asthenosphere.
Answer:
The very warm ocean waters warm the air above them and evaporate very large amounts of water vapor. This water vapor is the fuel for a hurricane as it strengthens via the latent heat released by condensation of the vast amounts of water vapor.
A barometer, it measures air pressure
