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On time scales lasting hundreds of millions of years, the supercontinents have assembled and broken apart.Roughly True multicellular organisms formed as cells within colonies became increasingly specialized.It has cognates in every Germanic language, and their proto-Germanic root has been reconstructed as *erþō.In its earliest appearances, eorðe was already being used to translate the many senses of Latin terra and Greek γῆ (gē): the ground, Originally, earth was written in lowercase, and from early Middle English, its definite sense as "the globe" was expressed as the earth.The remaining 29% is land consisting of continents and islands that together have many lakes, rivers and other sources of water that contribute to the hydrosphere.The majority of Earth's polar regions are covered in ice, including the Antarctic ice sheet and the sea ice of the Arctic ice pack.
Another convention capitalizes "Earth" when appearing as a name (e.g.This facilitated tool use and encouraged communication that provided the nutrition and stimulation needed for a larger brain, which allowed the evolution of humans.The development of agriculture, and then civilization, led to humans having an influence on Earth and the nature and quantity of other life forms that continues today. As a red giant, the Sun will lose roughly 30% of its mass, so, without tidal effects, Earth will move to an orbit 1.7 AU (250 million km; 160 million mi) from the Sun when the star reaches its maximum radius.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.
A nebula contains gas, ice grains, and dust (including primordial nuclides).