1A cindery, vesicular basaltic lava, typically having a frothy texture.
- ‘It's always slightly warmer on Rangitoto thanks to the black scoria, but the 360 degree view of the gulf and the volcano-studded cityscape of Auckland is matchless.’
- ‘Small vesicular pieces of volcanic material, scoria, collect around the vent to form a cinder cone.’
- ‘They cut steps in the frozen snow and made good progress along a ridge of ‘rugged scoriae’ which took them to the summit.’
- ‘Alluvial, colluvial or chemically formed gravel, clayey gravel, sandstone, limestone, tuff, scoria are examples of marginal materials.’
- ‘Some of these cones are now barely recognisable, having been excavated for the volcanic cinder, scoria, used to build the roads of Auckland.’
- 1.1 Slag separated from molten metal during smelting.
Late Middle English (denoting slag from molten metal): via Latin from Greek skōria refuse from skōr dung The geological term dates from the late 18th century.
We take a look at several popular, though confusing, punctuation marks.