The Earth

A planet	Solar system Source: aerospaceweb.org
The Earth is one of the planets of the solar system. It ranks third in proximity to the sun, which receives light and heat. It is approximately 150 million of kilometres far from the sun.

Surface's distribution

Water and land Most of its surface is water (75%) and its divided between oceans, seas, rivers and lakes. The remaining 25% is land distributed between continents and islands. The Earth colour seen from the space is blue, due to the sea water.

Spherical in shape The Earth planet is spherical in shape, but not perfect, as it is flattened by the poles. An imaginary perpendicular line to the axis of the Earth, the Equator, divides it into two hemispheres: North and South.

Ellipsoidal shape of the Earth. Animation Source: courses.soil.ncsu.edu

A alive planet

The Earth is the only planet of the solar system where life exists. This is possible due to a number of factors:

Terrestral radiation

Temperature: the Earth is far from the sun 150 million km, which allows life. Atmosphere: covers the Earth from pernicious solar radiation, protecting it and allowing life on it. Liquid water: essential for plants and animals.

Liquid water

Review

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Ejercicio

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Movements of the Earth

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© Jorge Juan Lozano Cámara, profesor del IES Juan de la Cierva de Vélez-Málaga
Licenciado por la Universidad de Granada (España)  

Ana María Marcos Sánchez, profesora del IES Juan de la Cierva de Vélez-Málaga
Licenciada por la Universidad de Málaga (España)

Kerry Elyse Hart, Licenciada por la Universidad de Richmond (Virginia, USA)