Nullarbor Plain is a part of which physical division?

The word australis means

1. northern
2. southern
3. eastern
4. western

Which of these deserts is not in Australia?

1. Great Victoria
2. Great Sandy
3. Gibson
4. Gobi

Which of these drainage basins is not a part of the central lowland?

1. Murray-Darling
2. Carpentaria
3. Nullarbor
4. Lake Eyre