| A | B |
|---|
| roughly | about; approximately |
| network | a system of connected travel routes or communication lines |
| rather | instead; more exactly |
| creatures | living beings |
| surface | the flat, top layer, or outer level of an object |
| incentive | motive; reason for doing something |
| hampered | hindered; slowed; made difficult |
| pressure | application of force against something |
| enclosed | to shut in, to place within, put inside |
| cylinder | a shape or object with a flat, circular top and bottom and straight sides |
| helmet | a protective head covering |
| descend | lower |
| density | a degree of concentration per unit area |
| species | a grouping of living things |
| hollow | empty; with nothing inside |
| diameter | the width of a circle, measured by a straight line through its center from side to side |
| diversity | variety |
| experts | specialists; masters at something; authorities |
