Erosion occurs naturally from weather or runoff but can be intensified by land-clearing practices related to farming, residential or industrial development, road building, or timber cutting. Acts as an aging process in a body of water and may cause decreases in dissolved oxygen. Accelerated aging of lakes by human activity is called cultural eutrophication. They have been intentionally or accidentally introduced outside their natural ranges. Also referred to as non-indigenous species.
Examples are the zebra mussel, spiny waterflea, and sea lamprey.
The many interconnected food chains of a biological community. A system of satellites, ground stations, and GPS receivers. HEAD - Restroom and toilet. Make sure door is locked when in use. IONS - Electrically charged atoms or groups of atoms that are capable of conducting an electrical current in water.