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The Earth was created 4.567 Billion Years ago. It was initially molten with only a thin hot crust, giving rise to the name of the first geologic time period: the Hadean (\"hell-like\").<\/p>\n","

Subduction started during the Archean Period and the first continental crust started to form from arc volcanoes that coalesced through obduction. <\/p>\n","

Single cellular life evolved and became widespread during the Proterozoic period (\"earliest life\") and photosynthesis started to pump oxygen into the atmosphere. <\/p>\n","

Multicellular life with hard body parts evolved during the Cambrian Explosion. This started to produce a robust fossil record for the period known as the Phanerozoic (\"visible life\"). <\/p>\n\n

<\/p>\n"],"taskDescription":"

Order the paragraphs to arrive at a brief overview of Earth's History. <\/p>\n"}

Four major events of Earth History

Kirsten Kennedy