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A nebula contains gas, ice grains, and dust (including primordial nuclides).

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Earth's lithosphere is divided into several rigid tectonic plates that migrate across the surface over periods of many millions of years.

About 71% of Earth's surface is covered with water, mostly by oceans.

Some geological evidence indicates that life may have arisen as much as 4.1 billion years ago.

Since then, the combination of Earth's distance from the Sun, physical properties, and geological history have allowed life to evolve and thrive.

Over 7.6 billion humans live on Earth and depend on its biosphere and natural resources for their survival.

Humans have developed diverse societies and cultures; politically, the world has about 200 sovereign states.

Over the period of hundreds of millions of years, the supercontinents have assembled and broken apart.

Roughly True multicellular organisms formed as cells within colonies became increasingly specialized.

Aided by the absorption of harmful ultraviolet radiation by the ozone layer, life colonized Earth's surface., much of Earth might have been covered in ice.

This hypothesis has been termed "Snowball Earth", and it is of particular interest because it preceded the Cambrian explosion, when multicellular life forms significantly increased in complexity., when an asteroid impact triggered the extinction of the non-avian dinosaurs and other large reptiles, but spared some small animals such as mammals, which at the time resembled shrews.

House styles now vary: Oxford spelling recognizes the lowercase form as the most common, with the capitalized form an acceptable variant.

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