Tectonic Plates
The Bay Bridge in San Francisco in 1989.
The Bay Bridge and Golden Gate Bridge.
The World Series is what Americans call the Baseball final.
Each continent is a Tectonic Plate.
Tectonic Plates are always moving.
This is how planet Earth looked 90 million years ago.
This is how planet Earth looked 150 million years ago. Dinosaurs were on the Earth then.
Plates colliding make huge mountain ranges like the Himalyas. Everest is in the Himalayas and that’s why Everest continues to grow higher. 50cm every 100 years
Plates Slide by each other most of the time, but sometimes they get stuck. Pressure continues to build and then one day it releases the pressure causing an earthquake.
The Ring of Fire is around the Pacific Plate. It has 452 volcanoes and 1000’s of earthquakes every year.
The Richter Scale invented by Charles Richter.
The scale gives a reading between 1 and 10. The 1989 San Francisco earthquake measured 6.9 on the Richter Scale.
The largest ever earthquake was in Chile in 1960. It measured 9.6 on the Richter Scale.
