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英语
- All four minor grain types are widespread in the pyroclastic fall deposit and are not restricted to any one portion or extent.en.wikipedia.org
- Another grain consisting of extremely rounded but glacially dissected quartz monzonite, are another small but widespread element of the pyroclastic fall deposit.en.wikipedia.org
- Particles falling from the eruption clouds form layers on the ground (this is pyroclastic fall or tephra).en.wikipedia.org
- The total area of recognisable pyroclastic fall was greater than 800,000 km.en.wikipedia.org
- They can occur in welded pyroclastic fall deposits and in ignimbrites, which are the deposits of pumiceous pyroclastic density currents.en.wikipedia.org
- At least four other minor grain types make up less than 1% of the pyroclastic fall deposit.en.wikipedia.org
- A pyroclastic fall deposit up to thick consists largely of light grey pumice grains that range in diameter from to.en.wikipedia.org
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英语