| Flap 1 | Flap 2 |
| all material arrived and deposited by glaciers | glacial drift |
| happens when a group of loose rocks fall down a steep slope. | rock fall |
| rapid movement of a large mass of mud | mudflow |
| a glacial deposit that is sorted into layers based on the size of the rock material | stratified drift |
| sudden rapid movement of a large amount of a material downslope | landslide |
| mudflows of volcanic origin | lahars |
| a ridge of till bulldozed ahead and deposited by a glacier | moraine |
| the final step in the erosional process | deposition |
| a type of mass movement in which soil moves slowly down a hill, sometimes causing posts and trees to lean | creep |
| glacial erosion in which frozen water removes rock fragments and adds them to the bottom of the glacier | plucking |
| a large, heavy mass of compacted snow and ice that moves slowly downhill because of the force of gravity | glacier |
| a thick deposit of fine, wind-eroded sediments | loess |
| a type of erosion in which loose materials are carried downslope by gravity | mass movement |
| unsorted mixture of rock and soil deposited by a retreating or melting glacier | till |
| the process that removes surface materials and transports them from one place to another | erosion |
| mass movement in which one large mass of loose material or rock layers tilts and moves downhill | slump |
| wind erosion that removes loose, fine-grained sediments such as clay or silt and leaves behind coarser material | deflation |
| The breakdown of rock into smaller and smaller pieces | weathering |
| the breakdown of rock into smaller pieces by physical means including: ice, wind, water, gravity, plants, animals | mechanical weathering |
| the grinding and wearing down of rock surfaces by other rock or sand particles | abrasion |
| the chemical breakdown of rock and minerals into new substances by something such as water, weak acids, and air | chemical weathering |
| precipitation that contains acids because of air pollution | acid rain |
| chemical reaction in which an element, such as iron, combines with oxygen to form an oxide | oxidation |
| a loose mixture of small mineral fragments and organic material | soil |
| the layer of rock beneath the soil | bedrock |
| the organic part of the soil, decayed plant and animal | humus |
| Top layer of soil, contains more humus than the other layers | topsoil |
| an area of shoreline made up of material deposited by waves | beach |
| place where land and a body of water meet | shoreline |
| a water current that travels near and parallel to the shoreline causing the sand to move in a zig zag pattern along the beach | longshore current |
| mound of wind-deposited sand that are common in deserts and along the shore of lakes and oceans | dune |
| the skipping and bouncing movement of sand sized particles in the direction the wind is blowing | saltation |
