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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.

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.

The most common rock constituents of the crust are nearly all oxides: chlorine, sulfur, and fluorine are the important exceptions to this and their total amount in any rock is usually much less than 1%.

Over 99% of the crust is composed of 11 oxides, principally silica, alumina, iron oxides, lime, magnesia, potash, and soda.

More precisely, the geoid is the surface of gravitational equipotential at mean sea level. It is composed mostly of iron (32.1%), oxygen (30.1%), silicon (15.1%), magnesium (13.9%), sulfur (2.9%), nickel (1.8%), calcium (1.5%), and aluminium (1.4%), with the remaining 1.2% consisting of trace amounts of other elements.

According to nebular theory, planetesimals formed by accretion, with the primordial Earth taking 10– Earth's atmosphere and oceans were formed by volcanic activity and outgassing that included water vapor.

"Earth's atmosphere") but writes it in lowercase when preceded by the (e.g. It almost always appears in lowercase in colloquial expressions such as "what on earth are you doing? The formation and evolution of Solar System bodies occurred along with the Sun.

In theory, a solar nebula partitions a volume out of a molecular cloud by gravitational collapse, which begins to spin and flatten into a circumstellar disk, and then the planets grow out of that disk along with the Sun.

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.

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