Defination of lithosphere.

The lithosphere (Greek: λίθος [lithos] for "rocky" + σφαῖρα [sphaira] for "sphere") is the rigid outermost shell of a ro... Read more »

Defination of atoms.

The atom is a basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negatively charged electrons. The atom... Read more »

Defination of atmosphere of the Earth.

The atmosphere of Earth is a layer of gases surrounding the planet Earth that is retained by Earth's gravity. The atmosphere protects li... Read more »

Defination of hydrosphere.

A hydrosphere (from Greek ὕδωρ - hydor, "water" and σφαῖρα - sphaira, "sphere") in physical geography describes the comb... Read more »

Defination of biosphere.

The biosphere is the global sum of all ecosystems. It can also be called the zone of life on Earth, a closed (apart from solar and cosmic ra... Read more »

Europe-The fifth largest continent

Europe (pronunciation: /ˈjʊərəp/ yewr-əp or /ˈjɜrəp/ yur-əp) is, by convention, one of the world's seven continents. Comprising the wes... Read more »

South America-The fourth largest continent

South America (Spanish: América del Sur, Sudamérica or Suramérica; Portuguese: América do Sul; Quechua and Aymara: Urin Awya Yala; Guarani:... Read more »

North America-The third largest continent

North America (Spanish: América del Norte or Norteamérica; French: Amérique du Nord; Dutch: Noord-Amerika; Papiamento: Nort Amerika; Kalaal... Read more »

Africa-The second largest continent

Africa is the world's second largest and second most populous continent, after Asia. At about 30.2 million km² (11.7 million sq mi) inc... Read more »

Defination of photosynthesis.

Photosynthesis (play /foʊtoʊˈsɪnθəsɪs/; from the Greek φώτο- [photo-], "light," and σύνθεσις [synthesis], "putting together... Read more »

Defination of transpiration.

Transpiration is a process similar to evaporation. It is a part of the water cycle, and it is the loss of water vapor from parts of plants (... Read more »

What is a Diatomic molecule?

Diatomic molecules are molecules composed only of two atoms, of either the same or different chemical elements. The prefix di- means two in ... Read more »

Defination of molecule.

A molecule (play /ˈmɒlɪkjuːl/) is an electrically neutral group of two or more atoms held together by covalent chemical bonds. Molecules are... Read more »

Defination of troposphere.

The troposphere is the lowest portion of Earth's atmosphere. It contains approximately 80% of the atmosphere's mass and 99% of its w... Read more »

Defination of stratosphere.

The stratosphere (pronounced /ˈstrætəsfɪər/) is the second major layer of Earth's atmosphere, just above the troposphere, and below the ... Read more »

Defination of mesosphere.

The mesosphere (pronounced /ˈmɛsoʊsfɪər/; from the Greek words mesos = middle and sphaira = ball) is the layer of the Earth's atmosphere... Read more »

Defination of thermosphere.

The thermosphere is the biggest of all the layers of the Earth's atmosphere directly above the mesosphere and directly below the exosphe... Read more »

Defination of exosphere.

The exosphere is the uppermost layer of Earth's atmosphere. In the exosphere, an upward travelling molecule moving fast enough to attain... Read more »

Defination of non-metals.

Nonmetal, or non-metal, is a term used in chemistry when classifying the chemical elements. On the basis of their general physical and chemi... Read more »

Defination of metals.

Metals are sometimes described as an arrangement of positive ions surrounded by a sea of delocalized electrons. Metals occupy the bulk of th... Read more »