You may know about the different chemical elements and the periodic table , but which elements are the ones that matter? The lovely infographic below which shows the natural abundance of those elements in the universe, inside the Earth, in the Earth's crust, in the oceans, in the atmosphere, and in us!

1. The Unstoppable Cycle

When we think of the Sun, we picture a glowing yellow ball in the sky that gives us our sunny days and leaves us during our starry nights. Did you know the Sun is a star? It is our star; it sits at the centre of our solar system and is 150 million kilometres away.