1. Unit 3: Across the U.S.A. Theme 5: One Country, Many Regions http://teach.fcps.net/trt14/US%20Regions/regions_copy.jpg

2. canyon- a deep valley surrounded by high, rocky walls Sometimes a stream runs through the bottom of a canyon. http://parryassociates.net/National%20Parks/aerial-grand-canyon.jpg

3. region- an area of land that has special features different from other areas of land, such as geography There are forest regions, desert regions, and mountain regions in the United States. http://www.naacp.org/unitfinder/region_map_515_3.jpg

4. surround- things that are on all sides of you or form a circle around you Surround sound speakers make you feel like you are at the movie theater. http://www.ar-avsolutions.co.uk/guides_surround.jpg

5. solution- the answer to a problem A missing piece was the solution to the puzzle. https://www.netalogue.com/ecommerce/solution-large.gif

6. dense- put together tightly or thick A forest is usually dense with trees. http://www.fs.fed.us/pnw/forests/local-resources/images/Dense%20plantation.jpg

7. aspect- refers to a particular part of something An enjoyable aspect of your summer vacation might be going to the swimming pool. http://www.angelarender.com/writer_internet_marketing_web_images/hsurvey_favorite_aspect_graph.jpg

8. impact- the strong effect that one thing has on another A thunderstorm would have a tremendous impact on your plans for a trip to the park. http://www.tqnyc.org/2009/00767/Thunderstorm.jpg

9. alter- to change it in some way One can alter facial expressions by using facial muscles. http://technabob.com/blog/wp-content/uploads/2008/08/alter_ego_3d_faces.jpg

10. climate- the weather in a place or area The climate can be different in each region of the United States. http://www.meteorologyclimate.com/climate-map.jpg

11. plateau- a large level area of high land In some parts of the United States, a plateau is surrounded by high mountains. http://www.cgrove417.org/fry/Science/Earth%27s%20Interior%20and%20Crust/EarthsCrustGraphics/ColoradoPlateau.jpg