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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Nearly 60 people died in the 1980 eruption of Mount St. Helens, an event that remains etched in the minds of most Americans older than 50.
To simulate lunar dust, the researcher used volcanic ash from Mount St. Helens, and also materials from Offplanet Research and Exolith Labs.
Source: https://gizmodo.com/liquid-nitrogen-moon-suits-free-lunar-dust-1850172542