No one wants to have it, but if one got it, he does not want to lose it. What is It?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

Different lights make me strange by changing me into different sizes. What am I?

How many times can you subtract the number 5 from 25?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

What has hands, but can’t clap?

A clock loses 10 minutes each hour. If the clock is set correctly at noon, what time is it when it reads 3 PM?

John was drowned by he was not wet. How?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?