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2. Earth - Wikipedia

   en.wikipedia.org/wiki/Earth

   Earth orbits the Sun, making Earth the third-closest planet to the Sun and part of the inner Solar System. Earth's average orbital distance is about 150 million km (93 million mi), which is the basis for the astronomical unit (AU) and is equal to roughly 8.3 light minutes or 380 times Earth's distance to the Moon .

3. History of Earth - Wikipedia

   en.wikipedia.org/wiki/History_of_Earth

   Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula. [4][5][6] Volcanic outgassing probably created the primordial atmosphere and then the ocean, but the early atmosphere contained almost no oxygen.

4. Internal structure of Earth - Wikipedia

   en.wikipedia.org/wiki/Internal_structure_of_Earth

   Earth's inner core is the innermost geologic layer of the planet Earth. It is primarily a solid ball with a radius of about 1,220 km (760 mi), which is about 19% of Earth's radius [0.7% of volume] or 70% of the Moon 's radius. [32][33] The inner core was discovered in 1936 by Inge Lehmann and is generally composed primarily of iron and some nickel.

5. 13 Surprising Earth Day Facts That Most People Don't Know - AOL

   www.aol.com/lifestyle/13-surprising-earth-day...

   Earth Day falls on April 22 each and every year, and while some may consider it to be something of a non-holiday, celebrated solely in grade school, it really is a day to celebrate the planet that ...

6. 25 Earth Day Facts—Plus, How To Help the Planet Today and ...

   www.aol.com/lifestyle/25-earth-day-facts-plus...

   Around 1 billion people take part in Earth Day activities around the world every year. 8. In the lead-up to Earth Day in 2024, millions of people worldwide will participate in Earth Hour on March ...

7. Geological history of Earth - Wikipedia

   en.wikipedia.org/wiki/Geological_history_of_Earth

   The geological history of the Earth follows the major geological events in Earth's past based on the geological time scale, a system of chronological measurement based on the study of the planet's rock layers (stratigraphy). Earth formed about 4.54 billion years ago by accretion from the solar nebula, a disk-shaped mass of dust and gas left ...