| A | B |
|---|
| beach nourishment | the practice of dumping new sand onto eroded beach |
| converging boundaries | Two plates move toward each other. One plate may move under another |
| core | Earth's innermost structure |
| dams | a wall across a river, behind it, a river collects into a reservoir |
| fossil | the remains or traces of a plant or animal that lived long ago |
| jetties | thin narrow walls built from the shore line into the ocean, used to protect harbor by keeping sand out of harbors, can stop sand from its natural flow |
| levees | a wall along a river channel, it serves to prevent flooding by keeping water behind it |
| lithosphere | shell formed from Earth's solid upper mantle and crust |
| mantle | a tall wall built along the rear edge of a beach. It can receive waves at high tide |
| seismic waves | the waves of energy that travel through the earth's crust making the ground shake |
| seismographs | a tool measures and records the seismic waves of an earthquake |
| seismologist | scientist who study earthquakes |
| storm drains | pipes or channels that carry away storm water, typically from streets or parking lot |
