| A | B |
|---|
| alert | watchful |
| breaks | comes apart |
| melt | turn from a solid to a liquid by heating |
| ocean | a great body of salt water that covers 3/4 of the Earth |
| thousands | ten hundreds |
| glacier | a large mass of ice formed from snow |
| iceburg | a large mass of ice floating in the sea |
| ice pack | a large area of ice floating |
| lifeboats | stong, open boats for saving lives |
| Titanic | large ship thought to be unsinkable |
