- A Mount Erebus disaster in 1979
- B Signing of the Antarctic Treaty in 1959
- C COVID-19 pandemic in 2020
- D Protocol on Environmental Protection coming into effect in 1998
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Answer:
A
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The Mount Erebus disaster in 1979 led to the suspension of overland sightseeing flights to Antarctica.
The disaster occurred when an Air New Zealand plane crashed into Mount Erebus, resulting in the loss of all 257 people on board.
As a result, overland sightseeing flights from Australia and New Zealand were discontinued.
However, commercial overflights from Australia resumed in the mid-1990s.
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