Answer to Question 1
The chemical tracer was diluted by spreading out over a large area. Each time the water containing the tracer encountered a sand grain, it had to flow around the grain. The flow of water over many curving paths caused the chemical tracer to spread out over a larger and larger area, diluting its concentration.
Answer to Question 2
In ground water, most of the water is in tiny pores and is in contact with nearby solid surfaces. Friction along these surfaces slows the water down. In a stream, only the thin layer of water along the perimeter of the channel is slowed down by friction.
Plant cell water potential.
Water potentials decrease (become more negative) as one moves from soil to plant to atmosphere
This chart illustrates the “drip down” model of government. In this, politics is formed by the soc
Water Loss Through Evaporation
ESM Study of Time Spent with Family
Hydrozoan. Hydra, a freshwater species capturing and digesting a water flea.