Why is a river so rich ?

Remove two matchsticks to make the below equation correct.

If an electric train is travelling south, then which way is the smoke going?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

He does not have any heart but still, He manages to live.
If you kill him, you will eventually die but yet you kill him.
He cannot run, who is He?

What work can one never finish?

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

What runs around the whole yard without moving?