For asteroids larger than 1km across, the consequences of an impact are global. But for smaller rocks, it all depends on whether it hits land or water. When an asteroid hits 200 metres across, a water impact would cause tsunamis across the oceans of the entire planet. Anything on the coasts would be affected.
The team calculated how severely various countries would be affected by a water strike in terms of lives lost and economic damage. China, Indonesia, India, Japan and the United States face the greatest overall threats.
Original Source: University of Southampton News Release
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