What word begins and ends with an E, but has only one letter?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

The more you take me, the more you leave me behind.
Who Am I?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

I get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?

If eleven plus two equals one, what does nine plus five equal?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Before Mount Everest was discovered, what was the highest mountain in the world?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?