Because it's harder to write with something in a square shape of a triangle shape.
Remember that.
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Any, the answer depends on what the experiment is about.
they used either the rain or chalk erasers because they only had chalk.
Chalk lines are to establish a continuous straight line for things like laying tile or setting bricks.
Chalk
The image is of someone keeping score on a blackboard. If you "chalk it up" to something, you acknowledge that whatever it was caused the result.You often hear this phrase as "Chalk it up to experience," which means that whatever happened was not the result you wanted, but you have learned something from it.