Short simple riddles

Every time you stand up, you lose this. What is it?

I'm very, very big. I like to eat peanuts and hay. I have four legs and two big ears. My long nose is called a trunk. I am an...

It is impossible to keep it until you give it someone else. What is that?

Which month has 30 days?

Something very extraordinary happened on the 6th of May, 1978 at thirty-four minutes past twelve a.m. What was it?

I build up castles. I tear down mountains. I make some men blind, I help others to see. What am I?

I am a seed with three letters in my name. Take away the last two and I still sound the same. What am I?

Lucky Sona fell off a 100 steps staircase without getting hurt! How?

Finish the sequence: 7 8 5 5 3 4 4 ?

Three lives have I. Gentle enough to soothe the skin, Light enough to caress the sky, Hard enough to crack rocks.