Surface
/sˈɜrfəs/
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Definition
(noun) The overside or upside of a flat object such as a table, or of a liquid.
Sentence Examples
One third of the earth's surface is desert.
The sea covers nearly three-fourths of the earth's surface.
CEFR Practice Quiz
The ____ of the calm lake looked like a polished mirror reflecting the beautiful trees and the blue sky today.