| A | B |
|---|
| scale model | is a physical model, a representation or copy of an object that is larger or smaller than the actual size of the object |
| irrigation | to water crops |
| aqueduct | transport water over long distances |
| excavator | large "shovel" used for digging |
| cylinder | super powerful "muscles" which can extend and contract |
| piston | forced forward and backward by hydraulic cylinders |
| force | strength or power exerted upon an object |
| surface area | the extent of a 2-dimensional surface enclosed within a boundary |
| simple machines | any of six or more elementary mechanisms, as the lever, wheel and axle, pulley, screw, wedge, and inclined plane |
| rotation | the act of rotating; a turning around as on an axis |
| hydraulics | area of engineering in which fluids are used to do work & generate power |
