Kinds of waves
    Intensity and magnitude
    Effects of quakes
    Prediction
    How to protect yourself
 
Earthquakes
An earthquake is a shaking of the ground caused by the sudden dislocation of material within the earth's outer layer, or crust. When forces pushing on a mass of rock overcome the friction holding the rock in place and blocks of rock slip against each other a earthquake may occur. Some earthquakes are so slight, and some occur in such remote areas, that they are barely felt. Others are so violent that they cause extensive damage.

Protecting yourself in case


1.) If an earthquake is occuring the most important thing to do is to DROP and COVER. Drop and cover means to fall on to the floor and get under something for protection. During an earthquake, if you are indoors, it is very important to stay calm and take cover under a heavy object.

2.) If you are outdoors, stay as far away from buildings as possible.

3.) Stay away from glass or anything that could fall.

4.) If you are in a crowded area, do not even consider running for the nearest exit. Everyone will be doing that, and crowding will lead to even more injuries. Take cover under something heavy and stay away from things that could fall on you. It is also very important to remain as calm as possible.

5.) Be prepared for aftershocks after the initial earthquake has ended. Aftershocks are follow-up earthquakes. They are smaller than the first one, but still are very dangerous.