EG - Vocab - Spreading rate

Indirect observation

The thickness of the Earth's crust

Credits and sources:
Map and documentation about how the map was produced: USGS



	Indirect observation Back Home The thickness of the Earth's crust Crustal thickness Credits and sources: Map and documentation about how the map was produced: USGS Questions for thought How fast is overall motion along the San Andreas Fault? How long will it be before San Diego and Oakland are neighbors?