How responsible are upstream communities for ensuring that high-quality water is delivered to downstream communities? will water wars increase in the next 50 years? be sure to include: deep aquifer research needs; the ogallala aquifer; and groundwater use and land subsidence in central florida and central mexico.

Air masses are characterized by various properties including temperature humidity air pressure and wind speed. which of the following air masses is associated with low relative humidity and high air temperature ?

1. crust 1 the metallic layer at the earth's center 2. inner core 3 the firm layer between the crust and the asthenosphere 3. lower mantle 2 the layer surrounding the inner core 4. asthenosphere 4 the semi-solid layer between the top layer and the upper mantle 5. upper mantle 5 the layer between the asthenosphere and lower mantle 6. top layer 6 the earth's outermost layer 7. outer core 7 the hottest part of the mantle

Explain how the movement of tectonic plates causes the development of different landforms and naturak disasters