Answer:
I am commonly abbreviated to H
I'm not a bird, but I can fly through the sky. I'm not a river, but I'm full of water. What am I?
Before Mount Everest was discovered what was the highest mountain on Earth?
Bright as diamonds, loud as thunder, never still, a thing of wonder. What am I?
Feed me and I live. Give me water and I die. What am I?
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk