Can you find the missing piece of the Porsche?

When we see 2 but call 10?

How many times in a given day, minutes and hour clock comes in a straight line ?

I look at you, you look at me I raise my right, you raise your left. What am I?

I look at you, you look at me, I raise my right, you raise your left. What am I?

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?