đá phấn
Học thuậtThân thiện
Definition
- Noun:
- Chalk: A soft, white, porous sedimentary rock, a form of limestone composed mainly of the mineral calcite. It is often used for writing on blackboards or in construction.
- Chalkstone: Refers to the rock itself, often found in deposits or quarries.
Usage Examples
- Noun:
- Vách đá này được hình thành từ đá phấn. (This cliff is formed from chalk.)
- Giáo viên dùng viên đá phấn để viết lên bảng. (The teacher uses a piece of chalk to write on the board.)
Advanced Usage
- Geological/Industrial Context: The term is used in geology and mining to describe the rock formation or the location where it is extracted.
- Mỏ đá phấn này đã được khai thác trong nhiều thập kỷ. (This chalk quarry has been mined for decades.)
Variants and Related Words
- Phấn viết bảng (n): Chalk (specifically for writing). This is a compound term specifying the use.
- Đá vôi (n): Limestone. A broader category of sedimentary rock that includes chalk.
Synonyms
- Craie (n): The French-derived term sometimes used in technical contexts.
- Chalkstone (n): A less common English synonym.
- Chalk