fourth grade science weather terms

The evolutionary process has developed over millions of years. Lineages evolved and split and modifications occurred gradually in stages. Life has been in existence on Earth for at least 3.5 billion years but the first two stages of evolution took place in the space of a billion years! The earlies..

Basic Terms Connected to Waves - The four important terms used in the study of waves are Wavelength, Amplitude, Frequency and Wave velocity. Wavelength ' l ' is the distance between two consecutive points on the wave which are in the same phase. (same phase means same state of v..

As wavelength is the distance covered during one oscillation and frequency is the number of oscillations per second, the product of the wavelength and frequency would give us the wave velocit..

Soil can be defined as the uppermost crust of earth mixed with organic material and in which animals and microorganisms live, and plants grow. The word soil is derived from a Latin word solum meaning ground. It is a stratified mixture of inorganic and organic materials, both of which are products o..

Soil - Soil can be defined as the uppermost crust of earth mixed with organic material and in which animals and microorganisms live, and plants grow. The word soil is derived from a Latin word solum meaning ground. It is a stratified mixture of inorganic and organic materials, both of which are pro..

For a layman the term 'work' implies any activity resulting in muscular or mental exertion. In physics, however, the term has a different meaning. It represents a physical quanti..

Population grows in geometrical proportions but food grows in only arithmetical proportion. With the ever increasing demand on food grains, fodder, fibre, vegetables, fruit, sugar and oil, there is an urgent need to increase crop production, as our land resources are limited. Our natural resources..

The term 'energy' used here has thus a slightly different meaning. The term 'energy' actually means 'the useful energy' or 'the energy that we can use'; for cooking, operating machines, to run vehicles and so on. And we get this useful energy only from specific sources, wh..

Introduction - For a layman the term 'work' implies any activity resulting in muscular or mental exertio..

Sodium carbonate exists as anhydrous (Na 2 CO 3 ) and also as hydrated salt. The decahydrated salt (Na 2 CO 3 .10H 2 O) is known as washing soda while the anhydrous salt is called soda ash. It occurs native as Na 2 CO 3 .NaHCO 3 .H 2 O) in Egypt, and as 'Reh' and 'Sajji' in several districts of Ut..