What has hands, but can’t clap?

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

Why Wine Glass Stem is so long?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

How many triangles can you count in the figure given?

You have two rectangular wires.

Both of them have property that when you light the fire from one end , it will take 60 minutes to get completely burn.

However, they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could you measure 45 minutes ?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?