| A | B |
|---|
| descend | to move from a higher level to a lower one; to go down |
| expert | someone with special skills or knowledge of a subject |
| network | a system of roads that cross each other and are connected to each other |
| rather | instead; more exactly |
| hampered | to make someone have difficulty moving, doing something, or achieving something |
| crush | to press something so hard that it breaks or is damaged |
| diameter | a line or measurement from one side of a circle to the other that passes through the center |
| diversity | variety |
| cylinder | a shape or object with circular ends and long straight sides |
| density | the relationship between an object's weight and the amount of space it fills |
| hollow | empty; with nothing inside |
| helmets | a hard hat that covers and protects your head |
| pressure | the force that a liquid has when it is pushed and held inside a container |
| creature | a living thing; an animal |
| rough | with strong winds and storms |
| enclosed | to surround something |
| surface | the outside or top layer of something |
| species | a group of animals or plants of the same kind that can breed with each other |
| incentive | something that encourages you to work harder or start a new activity |
