Final answer:
The simile compares the mom's behavior to a volcano, suggesting that she can become extremely angry and explosive when the student doesn't do their chores on time.
Step-by-step explanation:
This simile compares the student's mom's behavior to that of a volcano. Just like a volcano, the mom can become extremely angry and explosive when the student doesn't do their chores on time. It implies that the mom's anger can be intense and unpredictable.
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