I thought I'd go ahead an start the symmetrical thread about Ennis and the Earth to go along with the Jack and the Wind topic. Again all this seems vital in relation to the movie's tag line "love is a force of nature."
I realize that some people will prefer to see Ennis as Fire. I tend to like the earth idea. It reflects his brown/neutral colors and it reflects his character as the one who stays in one place, doesn't travel (except around a coffee pot) and is paralyzed to a certain extent by his own fears and emotional bind. He's the "down to earth" one who worries about the practical aspects of things in contrast to Jack the dreamer with his "head in the clouds" (air/wind). Maybe my favorite aspect of the earth/air or earth/wind idea is that it perfectly reflects the image of a mountain against the sky... the interaction between the air and earth is what's interesting... how one impacts or changes the other and how they harmonize with each other.
I think that fire can be seen as an element in their relationship (just like water) or fire can be seen as an element that comes from the earth (like a volcano... i.e. fireworks scene).
Here's one of my favorite descriptive passages from Proulx where wind (the storm/wind/breeze) and earth (mountain and stones) are activated and interact in a really interesting way. The wind seems to make the mountain come alive... and to sing.
"The next week Joe Aguirre sent word to bring them down - another, bigger storm was moving in from the Pacific- and they packed in the game and moved off the mountain with the sheep, stones rolling at their heels, purple cloud crowding in from the west and the metal smell of coming snow pressing on them. The mountain boiled with demonic energy, glazed with flickering broken-cloud light, the wind combed the grass and drew from the damaged krummholz and slit rock a bestial drone. As they descended the slope Ennis felt he was in a slow-motion, but headlong, irreversible fall."
Wow.