near areas

Earth is not a perfect sphere, but nearly so, with the approximate surface area 510926783 km 2 . Find the earth's diameter approximately. (Use π = 3.14) => 7198 km or 12756 km or 6378 km or 3189 km..

The liquid drops have nearly spherical shapes. Because of surface tension, the free surface of a liquid tends to attain minimum surface area. Since the sphere has minimum surface area for a given volume of liquid, the liquid tries to adopt spherical shape. Examples ar..

Sulphur Sulphur is found in the native state in meteorites, volcanoes and hot springs. Jupiter's moon Io owes its colours to various forms of sulphur. A dark area near the crater Aristarchus on the moon may be a sulphur deposi..

Any tall or massive objects will obstruct space waves, since they travel close to the ground. Consequently, shadow zones and diffraction will result. This is the reason for the need in some areas for antennas higher than would be indicated by Equation (1). On the other hand, some are..

Poles of a Magnet - The magnetic force appears to be concentrated at or near the ends of the magnet. These areas are called the magnetic poles. The pole of a suspended magnet which points towards the north, is called the 'north seeking pole (north pole)', the other pole is calle..

The space between soil particles on the surface of earth is called pore space. It is of two types - micro and macro pores. Most of the water is held in micro pores. Pores, which are available for plant roots. Surface soil pore spaces are generally filled with air and water. Water that per..

After the food is broken down into a soluble form, the intestinal walls of ileum absorb the nutrients and also water. Due to its larger surface area, thin wall lining the cavity and large number of finger-like projections, called the villi, maximum absorption takes place in this portion o..

Acidic water is dangerous to plants. Sulphuric and nitric acid rain washes nutrients out of the soil, damages the bark and leaves of trees and harms the fine root hairs of many plants which are needed to absorb water. Leaf pigments are decolorized because acid affects green pigment (chlorophyll) o..

Construction of sound proof rooms for noisy machines in industries. Use of horns with jarring sounds to be banned. Noise producing industries, aerodromes, and railway stations to be shifted away from the inhabited areas. Proper law should be enforced to check the misuse of loud..

Tribals staying within forest areas and villages bordering them need: Fuel as firewood Fodder for their cattle, as well as grazing of cattle Timber, thatch and bamboo for making slats for huts Implements for agriculture, fishing and hunting made of wood Baskets for collecting and s..