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The origins of the Earth and MoonMoon and the evidence for the first ocean are discussed. We explore: Were there any continents 4 billion years ago? What would the view from a beach have looked like 4 billion years ago? How large were the first tides? Was the first ocean salty? What colour was the first sky? When did life first arise in the ocean? During its early history, Earth became a “snowball”Snowball Earth; was the ocean ever frozen solid? What is the albedoAlbedo effect?

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The Ocean Begins

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  • 发表日期：

    2026年

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  • Peter Townsend Harris

摘要

The origins of the Earth and MoonMoon and the evidence for the first ocean are discussed. We explore: Were there any continents 4 billion years ago? What would the view from a beach have looked like 4 billion years ago? How large were the first tides? Was the first ocean salty? What colour was the first sky? When did life first arise in the ocean? During its early history, Earth became a “snowball”Snowball Earth; was the ocean ever frozen solid? What is the albedoAlbedo effect?