| A | B |
|---|
| aluminun | a very light, silver-white metal that does not tarnish easily |
| atmosphere | air that surrounds the earth |
| construction | act of constructing; building; putting together |
| crater | the opening at the top of a volcano |
| device | something invented, devised, or fitted for a particular use or special purpose |
| dial | plate or disk with numbers, letters, or marks on it and a moving pointer that shows how much there is of something |
| electronic | of or having to do with electrons or electronics |
| gravity | the natural force that causes objects to move or tend to move toward the center of the earth |
| horizon | line where earth and sky seen to meet |
| machinery | machines; the parts or works of a machine |
| manufacture | make by hand or machine |
| microphone | instrument for magnifying small sounds or for transmitting sounds |
| old-fashioned | out-of-date; of an old style |
| oxygen | a gas without color, taste, or odor that forms about one fifth of the air |
| progress | advance; growth; development; improvement |
| project | a plan; scheme |
| satellite | a heavenly body that revolves around a planet or other larger heavenly body |
| universe | all things; everything there is |
| vaccum | an empty space without even air in it |
| visible | able to be seen |
| fuel | material used to produce heat or power |
| gasoline | the fuel most commonly used in the engines of auto-mobiles and other vehicles |
| alcohol | a colorless liquid made from sugars and starches and used in medicine, in manufacturing, in intoxicating beverages, and as a fuel |
| gasohol | a fuel made from a mixture of gasoline and alcohol |
