| 1 | The lake has frozen over; you can walk on it. | |
| 2 | The ship was frozen in for the winter. | |
| 3 | Antarctica wasn't always a frozen wasteland. | |
| 4 | A decade ago these seas were icebound an average of 90 days a year. | |
| 5 | The birds are finding it difficult to catch fish in ice-locked wetland areas. |