- Industry: Government
- Number of terms: 30456
- Number of blossaries: 0
- Company Profile:
NOAA Coral Reef Conservation Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
Sound waves that have a frequency that is lower than what humans can hear (i.e. Below about 20 hertz). Some baleen whales and elephants produce infrasounds to communicate over long distances.
Industry:Natural environment
The political/social/economic process by which the environment is protected and resources are used wisely.
Industry:Natural environment
Sound waves that have frequencies higher than what humans can hear, usually greater than 20,000 Hz. Some animals such as bats, a species of cave bird, and cetaceans use these high frequency ultrasonic sounds for communication and navigation.
Industry:Natural environment
A statement that seems self-contradictory, yet may nevertheless be true.
Industry:Natural environment
The logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter; provides a measure on a scale from 0 to 14 of the acidity or alkalinity of a solution (where 7 is neutral and <7 is acidic and >7 is basic).
Industry:Natural environment
A mass of new tissue, with no useful physiological function, growing independently of its surroundings.
Industry:Natural environment
An extracellular material that forms the outer surface of plant, fungus, and certain bacterial cells. It is external to the cell membrane and serves in a structural and supporting role. The cell wall is composed primarily of cellulose and lignin in plants, chitin in Fungi, and peptidoglycans in bacteria.
Industry:Natural environment
A flowering plant, complete with leaves, a rhizome (an underground, usually horizontally-oriented stem) and a root system. They are found in marine or estuarine waters. Most seagrass species are located in soft sediments. However, some species are attached directly to rocks with root hair adhesion. Seagrasses tend to develop extensive underwater meadows.
Industry:Natural environment
