| A | B |
|---|
| tundra | a cold area in the Arctic region with no trees and few plants |
| permafrost | a layer of permanently frozen earth |
| lichen | a plant made by a fungus and an algae growing together on rocks or trees |
| pack ice | large, uneven layer of floating ice formed by ice pieces pressed together |
| aurora borealis | northern lights--luminous bands of flashing and moving light in arctic night sky |
| aurora australus | southern lights--luminous bands of flashing and moving light in antarctic night sky |
| iceberg | a mass of floating ice broken off a glacier |
| glacier | a large mass of ice formed from compacted snow |
