In the beginning of time, Rangi-Nui the sky father and Papa-Tua-Nuku were locked in a grasp and their children layed in between. They loved each other so much that they refused to let each other go.
Ranga and Papa's children were furious. the children wanted to separate their parents so they could emerge into ao Marama (The world of Light)
Tumatauenga (The spirit of war) was a fiercest. He wanted to kill his parents. The other children wanted to separate Rangi and Papa but in a more friendly manner. Everyone except for Ta-Whrima-Tea. (The spirit of winds)
Tumatauenga (The spirit of war), Haumia Tiketike (The spirit of uncultivated foods grown on land) and Tangaroa (The spirit of the sea) tried to separate their parents but failed. Tumatuaenga the warrior slashed their bodies. They bleed but despite the pain, they clung together.
Finally, Tane (The god of the forests) pushed against Rangi and Papa's bodies with his back on the ground and his feet pushing up. It took many years but eventually, Rangi-Nui was pushed into the sky. Finally light came into the world and the children could see. Plants and trees began to grow and the world became a green lush place. Tane created the first woman, Hine and their children became the first Maori people.
Rangi and Papa missed each other very dearly. They cried and eventually, Rangi's tears became the rivers and oceans we know today. The mist and fog are from Papa sighing in loneliness.