Riddles
Riddles!
This topic is about short riddles, because not everyone likes to do the larger logical puzzles. If you do like those, then click here.
If you've guessed the riddle, you can immediately post another one yourself. Let's keep it going. 
I will start with this riddle:
What is easy to get into, but hard to get out of?
It flattens things,
and without it,
it flattens you
It's in food
It's in buildings
It's in bridges too
Is this too hard?
or too soft for you?
Many things can create one, it can be of any shape or size, it is created for various reasons, and it can shrink or grow with time. What is it?
A Hole
@lazyKatz What did you call me? Hahaha! How great that ended up as the 1st post on this page.
From the east to the west
My presence you should not detest
As I'm essential for all, even though you take turns to view
But if I'm seldom around, you may become a little blue.
One shouldn't stare, but not cause it's rude
One shouldn't stare, or your vision may become skewed.
I'm low then I'm high, but it's not me that moved
It took long, and many, for this idea to be approved.
What/who am I?
@DarkWolf
Is it the sun?
I've been part of plots of yours, though you may not recall. It's not too hard to find me, for my house is very tall. I would come down to see you, but I can't survive the fall. What/who am I?