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The explosion of the Hunga Tonga-Hunga Ha'apai volcano is considered the greatest eruption on the planet in the last 30 years, according to reports. Geoscientists employing satellite data to monitor changes in the Earth's surface temperature were less surprised by the Tonga volcanic eruption than the rest of the world.

Researchers discovered that about a month prior to a submarine volcanic eruption in Japan, the color of the ocean started to change, suggesting that there could be a change in ocean colour before underwater volcanic activity.