What is acid rain? Definition and Simple Explanation: Acid rain refers to precipitation that has a lower pH than about 5.5 due to the action of various chemical substances. Rain is mainly caused by the absorption of nitrogen and sulfur dioxide (see also acids), which are released as by-products during the combustion of fossil fuels in heating systems and vehicles.
Atomic mass, symbol and atomic number Helium is a naturally occurring element with the element symbol He and atomic number 2. In the periodic table it stands with an atomic mass of 4.002 u in the 8th main group. The chemical element discovered by William Ramsay in 1895 is not radioactive and is in a gaseous state at room temperature.
Characteristics Name: Cockchafer Latin name: Melolontha Class: Insects Size: 1 - 3cm Weight:? Age: max. two months as a beetle Appearance: six-legged Sex Dimorphism: Yes Nutrition Type: Herbivore (herbivor) Nutrition: Leaves Origin: Europe, Asia Origin: unknown Sleep-wake cycle: diurnal Habitat: deciduous forests Natural enemies: rodents, birds Sexual maturity: immediately after metamorphosis to the beetle Mating season: April - June Oviposition: 10 - 100 Eggs Critically endangered: No You will find further descriptions of animals in the Encyclopaedia of Animals.
Definition: Blood is the bodily fluid in humans and all vertebrates, which in the organism undergo an extensive mass transfer, i.a. Oxygen uptake and carbon dioxide release, allows. One adult has a total blood volume of about 4 to 6 liters (women between 4-5l, men 5-6l).