[amp_mcq option1=”Granite” option2=”Chalk” option3=”Marble” option4=”Slate” correct=”option2″]
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 of limestone. It is a hard and dense rock that is often used for building and sculpture. Slate is a metamorphic rock composed of shale. It is a hard and brittle rock that is often used for roofing and flooring.
Chalk is the softest of these rocks and has the lowest crushing strength. It is easily scratched and can be broken with a hammer. Granite, marble, and slate are all harder rocks that are more difficult to break.