sedimentary rock

Cultural Dictionary
sedimentary rock [(sed-uh-men-tuh-ree)]

Rock that has formed through the deposition and solidification of sediment, especially sediment transported by water (rivers, lakes, and oceans), ice (glaciers), and wind. Sedimentary rocks are often deposited in layers, and frequently contain fossils.

Note: Limestone and shale are common sedimentary rocks.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Sedimentary rock is always a great word to know.
So is ort. Does it mean:
a scrap or morsel of food left at a meal.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
WordNet
sedimentary rock

noun
rock formed from consolidated clay sediments 
WordNet® 3.0, © 2006 by Princeton University.
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