The hydrologic cycle describes how water moves continuously in nature. From evaporation, condensation and surface runoff – water is always in motion.
When it rains, water zig-zags all the way through a tributary system to a river or lake. Like an upside-down umbrella, a watershed catches all rain water.
Despite the popular belief that groundwater exists as a huge lake underground, water actually exists in tiny pore spaces within rock and soil beneath our feet.
Because water is extremely versatile, it changes phases rapidly. The states of water are gas, liquid and solid. Water cycles through these phases in nature.
Eutrophication occurs in water bodies when too many nutrients are introduced. Over-fertilization of water causes algae to grow blocking sunlight for plants.
Streams carrying too much sediment clogs the entrance into the basin. As sediments dump in, water flow decelerates and widens the entrance forming a delta.