Can you answer these riddles?

Question

1.)
If there is too little of this, you crawl.
If there is too much of this, you fall.
What am I?

2.)
If I eat I continue to live
If I drink I begin to die
If you are near me you will live
If you are in me you will die
What am I?

3.)
Without me you are lost,
With me you remain,
Too much of me can kill you,
Too little of me can kill you
What am I?

4.)
I am the power brought down from heaven,
I can grant both life and death,
I am not the tears of heaven, nor the breath
I cut through the air like a knife
I always occur when the sky is unusually dark,
I never occur when the sky is normally light
What am I?

Answer 1

1. age
2. fire
3. water? or light?
4.lighting

Answer 2

1 - Gravity?
2 - Fire
3 - Water
4 - Lightning

Answer 3

1. age

2. fire

3. air?

4. lightning

Answer 4

1.age

2.fire

3.water

4.lightining