When it rains, the outer soil of the earth -absorbs it. Some water is evaporated and some is absorbed by roots of the trees and plants. The remaining part of the water goes downward due to gravitation. It goes as far below as, the openings and c...

There are many kinds of clouds. They are always changing their shape. They are formed at different heights. There is different temperature at different heights. The clouds are formed according to the height the moisture laden air. Clouds which are formed at the heig...

Falling stars have been a source of curiosity for men for thousands of years. But today with the advancement in science we do not call them stars. They are called "meteors".

They are small and solid bodies, travelling through space wh...

In the evening, the setting sun appears like a beautiful crimson red ball. But we all know it has not changed its colour.

Sunlight contains all colours. But the atmosphere on, around and over the earth contains molecules of water, vapour, dust, a...

When the sun raises all the stars disappear. The sun rays are so bright that stars are not visible to us. The sun generates so much brightness due to its immense heat. We can guess about this heat by reading following scientific facts about the sun.

(1) ...

Maps must be revised all the, time to take account of place name changes. Since 1950, many colonies have gained independence and changed place names that they associate with the past. For example, the French Colony of Upper Volta, which took its name from the River Vol...

Major floods can occur in several different ways. For example, in 1840, an earthquake caused a landslide in the Himalayas, damming the upper course of the River Indus, so that a lake soon formed. The lake was 64 km (40 miles) long and over 300 m (9841t) deep, and when thi...

We know that the Earth's crust and the top part of the mantle are split into rigid sections, called plates, which are up to 70-100 km (43-62 miles) thick. Beneath the plates, temperatures are high and the rocks are semi-molten. Currents in the molten material are mo...

Many waterfalls occur where rivers flow over hard rock’s which overlie softer ones. The hard rock’s resist erosion, while the softer rocks are worn away. The hard lip of the waterfall often overhangs the softer rock and slabs of hard rock sometimes break off and cr...

Rocks that were formed in the last 2,800 million years can be found in every continent, but rocks more than 3,500 million years old are extremely rare. Some rocks in the American Minnesota River valley and others in western Greenland have been dated at abo...