| A | B |
|---|
| volcanoes | openings in the earth's surface from which rock, gas and steam are forced out. Mountains form from the hardened materials thrust out |
| fossils | the hardned remains of plats or animals that lived a long time ago |
| seashells | the shells of sea animals, such as clams or oysters |
| plaster | a soft, sticky mixture of lim, sand and water that hardens as it dries |
| ichthyosaur | a gentle reptile with a fishlike body and a long snout that lived millions of yars ago |
| engineer | a person who is trained to design and build things like roads, bridges, or buildings |
| bedrock | the solid layer of rock that lies deep beneath the soil |
| framework | the part of a building or structure that gives it shape and holds it up |
| contractor | a person whose job is to make sure workers and supplies are at a building site |
| cranes | large machines used for lifting or moving heavy objects |
| hoists | machines used to raise objects |
| superstructure | the part of a building that rises above the basement |
