Riddle #661

I am as big as you are, but I am weightless. Who am I?

I am a 5 letter word. Take away the first letter and I am a country's name. Take away the first two letters and I become the opposite of the 5 letter word. Who am I?

A father's child, a mother's child, yet no one's son. Who am I?

Slayer of regrets, old and new, sought by many, found by few. What am I?

I eat other animals. I have a big mouth. I am green. I live in the water. Who 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 have all the knowledge you have. But I am small as your fist that your hands can hold me. Who am I?

If will follow you for 1000 miles but not miss home. It desires neither food nor flowers. It fears not water, fire, knives, nor soldiers. But it disappears when the sun sets behind the western mountains. Who Am I?

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?

We are a family of 12 members. I am the second. I am also the youngest in our family. Who am I?

I build bridges of silver and crowns of gold. Who am I?