Earth

The Universe is defined as everything that physically exists: the entirety of space and time, all forms of matter, energy and momentum, and the physical laws and constants that govern them. However, the term "universe" may be used in slightly different contextual senses, denoting such concepts as the cosmos, the world or Nature.

Globe is a hollow sphere representing Earth and illustrated with the continents, seas, and islands, especially one showing and labeling the countries

The World is a proper noun for the planet Earth envisioned from an anthropocentric or human world view, as a place inhabited by human beings. It is often used to signify the sum of human experience and history, or the 'human condition' in general.The world population is over 6.80 billion people.

Earth is the only place in the universe where life is known to exist. Scientific evidence indicates that the planet formed 4.54 billion years ago, and life appeared on its surface within a billion years. Since then, Earth's biosphere has significantly altered the atmosphere and other abiotic conditions on the planet, enabling the proliferation of aerobic organisms as well as the formation of the ozone layer which, together with Earth's magnetic field, blocks harmful radiation, permitting life on land.

Earth's outer surface is divided into several rigid segments, or tectonic plates, that gradually migrate across the surface over periods of many millions of years. About 71% of the surface is covered with salt-water oceans, the remainder consisting of continents and islands; liquid water, necessary for all known life, is not known to exist on any other planet's surface. Earth's interior remains active, with a thick layer of relatively solid mantle, a liquid outer core that generates a magnetic field, and a solid iron inner core.

A natural satellite or moon is a celestial body that orbits a planet or smaller body, which is called the primary.

Earth has only one natural satellite, the Moon. But thousands of small artificial satellites have also been placed in orbit around the Earth.

Earth is the third planet from the Sun and the fifth largest:

    orbit:    149,600,000 km (1.00 AU) from Sun    
    diameter: 12,756.3 km 
    mass:     5.972e24 kg

The earth consists of seven continents listed as follows: North America, South America, Antarctica, Africa, Europe, Asia and Australia; the largest of which is Asia.

71 Percent of the Earth's surface is covered with water. Earth is the only planet on which water can exist in liquid form on the surface (though there may be liquid ethane or methane on Titan's surface and liquid water beneath the surface of Europa). Liquid water is, of course, essential for life as we know it. The heat capacity of the oceans is also very important in keeping the Earth's temperature relatively stable. Liquid water is also responsible for most of the erosion and weathering of the Earth's continents, a process unique in the solar system today (though it may have occurred on Mars in the past)