| A | B |
|---|
| outback | inland areas of Australia west of the Great Dividing Range |
| coral reef | long undersea structure formed by the tiny skeletons of coral, a kind of sea life |
| geyser | spring of water heated by molten rock inside the earth that, from time to time, shoots hot water into the air |
| high island | mountainous island in the Pacific Ocean formed by volcanic activity |
| low island | type of island in the Pacific Ocean formed by the buildup of coral |
| atoll | circular shaped islands made of coral |
| continental island | island formed centuries ago by the rising and folding of the ocean floor due to tectonic activity |
| ice shelf | thick layer of ice that extends above the water |
| iceberg | huge piece of floating ice that broke off from an ice shelf or glacier and fell into the sea |
| marsupial | mammals that carry their young in a pouch |
