Riddle #1075

Two sisters we are, one is dark and one is fair, In twin towers dwelling we're quite the pair, One from land and one from sea, Tell us truly, who are we?

You bury me when I am alive, and dig me up when I die. What am I?

Everyone in the world break me when they speak every time. Who am I?

Until I am measured I am not known. Yet how you miss me when I have flown.

Alive as you but without breath, As cold in my life as in my death; Never a thirst though I always drink, Dressed in a mail but never a clink.

For thousands of years, Seen only in tale. The wind as a sail, For one thunderous gale. Shiny stores rich in lore, The burning temper, like Earth's core. What am I?

When you do know me about me, them I am definitely something. You will always search for me. But when you know me, I am nothing. Who am I?

I go around in circles, but always go straight ahead. I never ever complain, no matter where I am lead

My antlers tower above my head. Where I live it’s cold all year. I can pull a sled or pack a load. You call me a ?

Never was, I am always to be. No one ever saw me, nor ever will. And yet I am the confidence of all, to live and breathe on this terrestrial ball. What am I?

I drift forever with the current down these long canals they've made. Tame, yet wild, I run elusive, multitasking to your aid. Before I came, the world was darker. Colder, sometimes, rougher, true. But though I might make living easy, I'm good at killing people too.