| A | B |
|---|
| tectonic plate | an enormous moving shelf that forms the earth's crust |
| fault | a fracture in the earth's crust |
| seismograph | a device that measures the size of the waves created by an earthquake |
| epicenter | the point on the earth's surface that corrsponds to the location in the earth where an earthquake begins |
| tsunami | a giant ocean wave, caused by an underwater earthquake or volcanic eruption, withe great destructive power |
| Ring of Fire | the chain of volcanoes that lines the pacific rim |
| weathering | the conditions of the atomsphere at a particular location and time |
| sediment | small pieces of rock produced by weathering processes |
| mechanical weathering | natural processes that break rock intosmaller pieces |
| chemical weathering | a process that changes rock into a new substance through interaction among elements in the air and the minerals in the rock |
| erosion | the result of weathering on matter created by the action of wind, water, ice or gravity |
| delta | a fan-like landfrom made of deposited sediment, left by a river that slows as it enters the ocean |
| loess | wind-blown silt and clay sediment that produces very fertile soil |
| glacier | a large long-lasting mass of ice that moves because of gravity |
| glaciation | that chaning of landforms by slowly moving glaciers |
| moraine | ridge or hill of rock carred and finally deposited by a glacier |
| humus | organic material in soil |
