When an object is moving towards us the waves compresses in a way that it has

The ozone hole appears in antarctica during

Aprisoner is forced to go into one of three rooms, but he can choose which room. the first room is ablaze with fire. the second one is rigged with explosives that will go off as soon as he enters. the third contains a pair of lions who haven't eaten in years. which room should he choose to survive?

Bonds within one water molecule are examples of