There was an aeroplane crash, every single person died, but two people survived. How is this possible?

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

Can you find out which triangle will have a bigger area among the following?
1. A triangle with sides 300, 400 and 500
2. A triangle with sides 300, 400 and 700

While handling a project, the landscaper is asked by the owner of the mansion that he wants four trees in front of his mansion that are exactly equidistant from each other.

How will he do it?

Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.

What is the word or phrase below?
R | E | A | D

There's a day, that comes around once a year.
To celebrate the man, you hold dear.
He gave you life, love and will pick you up if you fall.
When it comes to guys like him, He's the best of all.
Who is he?

Can you find the missing piece of the Porsche?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

People make me, save me, change me, raise me. What am I?