An earthquake is a sudden shaking of the ground caused by movement deep inside the Earth. The ou layer o the pla is bro into la pieces cal plates, wh move ve slowly. Some the ed of two plates get stuck while the rest of the plates keep moving. Pressure builds up until the rocks suddenly break and slip, releasing energy in waves that travel through the ground. Most earthquakes are too small for people to feel.

Type only the missing letters. Each box is one letter, and the number of boxes matches the letters that are missing.