| Questions | Answers |
|---|---|
| a large section of land that is a part of a continent | subcontinent |
| the long-term trends in weather elements and atmospheric conditions | climate |
| to become an expert in a particular subject,skill or trade;to produce a limited variety of goods & services | specialize |
| to dig out material | excavate |
| a system to dispose of wastewater | sewer system |
| to move from one country or place to another | migrate |