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2. 50 Earth Day Trivia Questions and Answers to Inspire ... - AOL

   www.aol.com/50-earth-day-trivia-questions...

   Earth Day is on April 22, but really, it should be every day—saving the planet should be a daily occurrence! From conservation to wildlife to politics, test your environmental and historical ...

3. Test your global knowledge with these Earth Day trivia questions

   www.aol.com/news/earth-day-quiz-whats-one...

   Answer: 1 billion. Which nonfiction book set the Earth Day movement in motion? Answer: “Silent Spring” by Rachel Carson. Earth day quiz. What is the most abundant gas in Earth’s atmosphere ...

4. Atmosphere of Earth - Wikipedia

   en.wikipedia.org/wiki/Atmosphere_of_Earth

   How Earth at that time maintained a climate warm enough for liquid water and life, if the early Sun put out 30% lower solar radiance than today, is a puzzle known as the "faint young Sun paradox". The geological record however shows a continuous relatively warm surface during the complete early temperature record of Earth – with the exception ...

5. History of Earth - Wikipedia

   en.wikipedia.org/wiki/History_of_Earth

   The history of Earth is divided into four great eons, starting 4,540 mya with the formation of the planet. Each eon saw the most significant changes in Earth's composition, climate and life. Each eon is subsequently divided into eras, which in turn are divided into periods, which are further divided into epochs . Eon.

6. Geologic time scale - Wikipedia

   en.wikipedia.org/wiki/Geologic_time_scale

   Geologic time scale. The geologic time scale, proportionally represented as a log-spiral with some major events in Earth's history. A megaannus (Ma) represents one million (10 6) years. The geologic time scale or geological time scale ( GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating ...

7. 20 Biggest Questions in Science - AOL

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   In this article we are going to list the 20 biggest questions in science.Click to skip ahead and jump to the 10 biggest questions in science.If your ancestor from a few centuries ago was to pop up ...

8. Geology - Wikipedia

   en.wikipedia.org/wiki/Geology

   Geology (from Ancient Greek γῆ (gê) 'earth', and λoγία ( -logía) 'study of, discourse') [1] [2] is a branch of natural science concerned with the Earth and other astronomical objects, the rocks of which they are composed, and the processes by which they change over time. [3]

9. Internal structure of Earth - Wikipedia

   en.wikipedia.org/wiki/Internal_structure_of_Earth

   The internal structure of Earth is the layers of the Earth, excluding its atmosphere and hydrosphere. The structure consists of an outer silicate solid crust, a highly viscous asthenosphere and solid mantle, a liquid outer core whose flow generates the Earth's magnetic field, and a solid inner core . Scientific understanding of the internal ...