| A | B |
|---|
| groundwater | any water drawn from below the water table |
| porosity | the percentage of total volume of a substance consisting of pore spaces |
| aquifer | permeable rock strata that transmit ground water freely |
| Mississippi River | largest river by discharge in North America |
| Hydrologic cycle | continuous movement of water from oceans to atmosphere, atmosphere to land, and land back to sea |
| running water | the single most important erosional agent |
| rectangular | drainage pattern characterized by many right angles |
| dendritic | most common drainage pattern, determined chiefly by the slope of the land |
| radial | drainage pattern where streams diverge from a high point like spokes from a wheel |
| suspended load | usually consists of fine sand, silt, and clay-sized particles |
| natural levee | depositional feature essentially parallel to the stream or river |
| Amazon | world's largest river in terms of discharge |
| discharge | product of channel depth, channel width, and velocity |
| gradient | vertical drop of a stream channel over a certain distance |
| transpiration | release of water vapor to the atmosphere by plants |
| cutbanks | where erosion occurs in a meander of a stream |
| limestone | source of most common underground cave occurence |
| stalactites | hang from the ceiling of a cave |
| stalagmites | form from the floor of a cave |
| karst topography | sinkholes, soluble rock, sinking cracks and cavern formation |
