The stone whose crushing strength is least, is A. Granite B. Chalk C. Marble D. Slate

The correct answer is B. Chalk.

Chalk is a soft sedimentary rock composed of the mineral calcite. It is easily scratched and has a low crushing strength. Granite, marble, and slate are all harder rocks with higher crushing strengths.

Granite is an igneous rock composed of quartz, feldspar, and mica. It is a very strong and durable rock. Marble is a metamorphic rock composed

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