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  1. Web23 hours ago · Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula. …

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    • What is Earth Day, when is it and what has it achieved? - BBC

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      The Earth sciences are the fields of study concerned with the solid Earth, its waters, and the air that envelops it. Included are the geologic, hydrologic, and atmospheric sciences. Their broad aim is to understand Earth’s present features and past evolution and to use this knowledge to benefit humankind.
      Our atmosphere is made mostly of nitrogen and has plenty of oxygen for us to breathe. The atmosphere also protects us from incoming meteoroids, most of which break up in our atmosphere before they can strike the surface as meteorites. Since we live here, you might think we know all there is to know about Earth. Not at all, actually!
      It is widely accepted by both geologists and astronomers that Earth is roughly 4.6 billion years old. This age has been obtained from the isotopic analysis of many meteorites as well as of soil and rock samples from the Moon by such dating methods as rubidium–strontium and uranium–lead.
      The event began in 1970 in the United States, and is now marked around the world. What is Earth Day and when is it? Earth Day is a global event which aims to highlight the importance of protecting the environment. It takes place every year on 22 April.
    • earth sci·ence
      noun
      1. the branch of science dealing with the physical constitution of the earth and its atmosphere:
        "undergraduates in earth science"
      More about earth science
    • Earthpedia • Learn about plants, animals, and more! • Earth.com