Unit 3: Then and Now Theme 6: Roads to Travel On

frontier- a place where land is natural and unsettled Few people live on a frontier.

transit- a system that allows people to get from place to place A train is an example of a transit system.

elegant- graceful and beautiful The cake had a very elegant design.

technology- the study of how objects work A lot of research is needed in the development of technology.

construction- to build something Safety is very important on any construction site.

agriculture- farming or growing plants for food There is plenty of agriculture in the state of Louisiana.

explore- to search a new place to discover new things We will explore the Grand Canyon when we arrive in the state of Arizona.

fuel- provides power to different kinds of machines Gas and coal are sources of fuel.

adventure- an exciting experience Experiencing a theme park can be an exciting adventure.

aviation- flying an airplane The Wright Brothers made aviation possible.