Friday, May 24, 2013
Elephants eat grasses, leaves, bamboo, bark, roots. Elephants are also known to eat crops like banana and sugarcane which are grown by farmers. Adult elephants eat 300 400 lbs of food per day.
Elephants form deep family bonds and live in tight matriarchal family groups of related females called a herd, Elephants are extremely intelligent animals and have memories that span many years, Because of their large size, elephants have a huge impact on their environments and are considered keystone species. Their habit of uprooting trees and undergrowth can transform savannah into grasslands. When they did for water during drought, they create waterholes that can be used by other animals
Elephants are large mammals of the family Elephantidae and the order Proboscidea. Traditionally, two species are recognised, the African elephant (Loxodonta Africana) and the Asian elephant (Elephas maximus), although some evidence suggests that African bush elephants and African forest elephants are separate species
Friday, May 10, 2013
The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (O3). The ozone layer can be depleted by free radical catalysts, including nitric oxide (NO), nitrous oxide (N2O), hydroxyl (OH), atomic chlorine (Cl), and atomic bromine (Br)
The ozone layer spreads like a sheet in earth's atmosphere. The sun's rays consists of most of the rays other than the visible part. It specially consists of UV and IR rays. Among them UV [ultra violet rays] is the most harmful one to human skins. It causes skin diseases in contact with human skin. The main function of ozone layer is to filter these UV rays from the sun and so protecting life. Though it is a poisonous gas
But the cloroflurocarbon CFC gas from the refrigerators affect the ozone layer which results in several holes in the layer
A rainbow is an optical and meteorological phenomenon that is caused by reflection of light in water droplets in the Earth's atmosphere. This immense, curved spectrum of light appears only when both the elements of sunshine and rainfall present.
If the sun, the eye, and the center of the rainbow's arc are not in a straight line, the show is over, before it began. This explains why we only see rainbows in the early morning or late afternoon…it is physically impossible for us to align our eyes with the sun at other times of day, as it is high above our heads! Logically, a morning rainbow appears when the sun shines in the east, and the rain falls in the west, and an afternoon rainbow appears when the sun shines in the west, and the rain falls in the east.
THE SEVEN MAIN COLORS