The difference between Dropstone and Erratic
When used as nouns, dropstone means an isolated fragment of rock found within a sedimentary rock (that had fallen, rather than being carried along), whereas erratic means a rock moved from one location to another, usually by a glacier.
Erratic is also adjective with the meaning: unsteady, random.
check bellow for the other definitions of Dropstone and Erratic
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Dropstone as a noun (geology):
An isolated fragment of rock found within a sedimentary rock (that had fallen, rather than being carried along)
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Dropstone as a noun (glaciology):
An isolated rock that is geologically distinct from the surroundings indicating that it was carried from a distant area and then dropped in place (by a melting glacier)
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Erratic as an adjective:
unsteady, random; prone to unexpected changes; not consistent
Examples:
"Henry has been getting erratic scores on his tests: 40% last week, but 98% this week."
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Erratic as an adjective:
Deviating from normal opinions or actions; eccentric; odd.
Examples:
"erratic conduct"
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Erratic as a noun (geology):
A rock moved from one location to another, usually by a glacier.
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Erratic as a noun:
Anything that has erratic characteristics.