What has a ring but no finger?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

what one word does the below rebus identifies?

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

The more it dries, the wetter it becomes. Can you tell what it is?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

A charming young lady was approached by a kind looking old woman in a restaurant. The old woman said to her, 'You look exactly like my younger daughter. Sadly she passed away a couple of months back. Could you do me a favor and say 'Goodbye, mother' with a kind smile on your face when I leave?

The young lady agreed for the same and said, 'Goodbye, mother' when the old woman left. Soon after, she got the most disengaging shock of her life.

Can you guess what the shock was?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?