Water budget

a model that estimates how much water enters and leaves a particular area, and through which mechanisms (R1)


smog-like air pollution caused by volcanic gases and particulates (R1)


the process of vaporizing water through plant leaf surfaces (R1)

Surface water

water that flows across or is pooled on the surface of the land, as in streams and ponds (R1)


process through which the balance among species within a natural community changes over time (R4)


water that flows across the land surface and into stream channels promptly after rainfall (R1)


a rootlike plant stem that grows underground or along the ground surface, is often thickened by deposits of reserve food material, and produces shoots above and roots below (R5)

Relative humidity

the ratio between the amount of water vapor in the air currently and the highest amount of water vapor possible in the current air temperature (R1)


a measured, designated land area used in a scientific study such as a vegetation survey (R4)