Another word for a natural disaster is a natural ......... .

When a natural disaster occurs, it's often called an environmental......... This happens when a bad situation evolves into a critical phase.

An ......... is declared when unforeseen circumstances occur and require immediate action. For example, the president declared this after Hurricane Katrina hit the United States.

The Red Cross provides medical ......... when natural disasters strike. This group is made up of professionals and volunteers who try to help the people who are directly and indirectly affected by a natural disaster.

The people who outlive natural disasters, those who are not killed by the tragedies, are called the ......... .

Unfortunately, many ......... are injured when a natural disaster strikes. These are the people who have been injured or killed as a direct result of the tragedy.

Many ......... are trained beforehand in order to save those in need in a time of crisis. These people are sent out on various missions to help those who are in the middle of a natural disaster. They try to save people who are in dangerous situations by risking their own lives in the process.

A natural disaster is a sudden, environmental calamity that causes a great amount of damage, loss,......... and hardship for those who are affected by it.

Natural disasters often cause a lot of damage to the ......... , like buildings, bridges and houses, in populated areas.

Those, whether dead or alive, who cannot be found after a natural disaster strikes are called the ......... This means that they or their bodies cannot be located.