Riddle time (who am I)

1

I can fly,
But I'm not a bird.
I love sleeping during the day.
And I'm black colored.
Who am I?

2

Burn in the ocean.

White as snow

But when I fall back to water,

I disappear without a trace.

Who am I?

3   

I've no voice

but I can teach you all there is to know

Once I've told you all,

I cannot tell you more.

Who I am?

4

I can't go left.

Nor can I go right.

I'm forever stuck in a building.

Use me to go to greater heights.

Who am I?

5

I'm always with you

and sometimes ahead of you

sometimes behind you,

and sometimes smaller than you.

Who I am?

Answer:

..

...

..

..

..

,,

,,

,,,

,,

,,

,,

,,

,,

,,

,,

,,

,,

,,,,,

,..

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1:Bat,

2:Salt

3:Book

4: Elevator

5:Shadow