What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Can you count the number of quadrilaterals in the picture below?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

Why did the Girl throw the butter out of the window?

By using 'because' continuously three times, can you make an English statement ?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

A man is approaching a broad and barren land. He has a package with him. If somehow, he is unable to open the package before reaching the land, he will die.

Can you guess what is present in the package?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

Can anyone tell me a word in the English dictionary which has a silent 'z'?