but since our planet was formed around 4.6 billion years ago, the length of a day has been gradually growing. A day is the time period of a full rotation of the Earth with respect to the Sun.

In this collection of trivia bits, you'll find interesting facts on how the ... U.S. Geological Survey, the earth's geological age is estimated to be approximately 4.5 billion years old.

We came across a superb infographic released by Giraffe, who are childcare and early learning specialists, which states 50 awesome facts about Earth. The first one that caught our eye is that ...

3. It is more about rebuilding connection than just switching off - Earth Hour is the moment when local and global communities unite and switch off to show they care about the future of our planet. 4.

And in the meantime - keep reading for ten facts you didn't know about ... and the Colosseum take part, too. 4. The aim is simple - save our planet Earth Hour isn't just about switching off ...