| A | B |
|---|
| crust | outermost layer of earth |
| lithosphere | composed of crust and upper mantle |
| asthenosphere | composed of lower mantle and core |
| plasticity | solids ability to flow |
| gutenberg discontinuity | division between mantle and core |
| moho discontinuity | division between crust and mantle |
| silicon and oxygen | two most abundant elements in crust |
| iron and nickel | 2 most abundant elements in core |
| focus | where earthquake originates |
| epicenter | above the focus |
| three | number of reading needed to determine epicenter |
| p waves | travel through solid liquid and gases |
| s waves | stopped in liquids, travel only through solids |
| surface waves | combination of p and s waves do most damage |
| seismic gap | place where tectonic plates touch |
| richter scale | used to rate the magnitude of an earthquake |
