The bits we live on are mostly solid chunks which we call “land” floating on this gooey mess, bumping into each other, pushing over and under each other as they have done for billions of years and surrounded, marvellously, with a thin layer of another remarkable fluid - water - in what we call “oceans”.
On the surface - or very near it - there has been another marvellous development - it is called "life", in millions of diverse forms.
