1. Unit 3: Then and Now Theme 6: Roads to Travel On http://upload.wikimedia.org/wikipedia/commons/thumb/3/3e/I-80_Eastshore_Fwy.jpg/800px-I-80_Eastshore_Fwy.jpg

2. frontier- a place where land is natural and unsettled Few people live on a frontier. http://geopolicraticus.files.wordpress.com/2009/03/palmer-across-the-continent.jpg

3. transit- a system that allows people to get from place to place A train is an example of a transit system. http://www.japaneselifestyle.com.au/travel/images/japanese_bullet_train.jpg

4. elegant- graceful and beautiful The cake had a very elegant design. http://2.bp.blogspot.com/_3-NhrEYv8dA/SaLewGuhUSI/AAAAAAAAAmk/ExDB0nJ0Jxo/s400/cake2.jpg

5. technology- the study of how objects work A lot of research is needed in the development of technology. http://esask.uregina.ca/management/app/assets/img/enc2/selectedbig/51F17CA9-1560-95DA-439C7A802F7A9959.jpg

6. construction- to build something Safety is very important on any construction site. http://goswickbuilding.com/files/QuickSiteImages/construction-man-in-hard-hat.jpg

7. agriculture- farming or growing plants for food There is plenty of agriculture in the state of Louisiana. http://www.biofuelsrevolution.com/images/grass-stains/Harvesting-Sugar-Cane.jpg

8. explore- to search a new place to discover new things We will explore the Grand Canyon when we arrive in the state of Arizona. http://naturescrusaders.files.wordpress.com/2009/05/grandcanyon.jpg

9. fuel- provides power to different kinds of machines Gas and coal are sources of fuel. http://images.businessweek.com/ss/07/10/1018_shanghai_stocks/image/yitai_coal.jpg

10. adventure- an exciting experience Experiencing a theme park can be an exciting adventure. http://www.destination360.com/north-america/us/florida/islands-of-adventure

11. aviation- flying an airplane The Wright Brothers made aviation possible. http://www.rootcandles.com/userfiles/image/Wright-brothers-A-I-Root.jpg