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A British Columbia teacher has had his teaching certificate revoked after using a student’s body to demonstrate volcanic activity as part of a science lesson. Mount Karangetang in Indonesia's North Sulawesi province, photographed April 4, 2013.STRINGER/Reuters

A B.C. science teacher has had his teaching certificate cancelled after stroking a female student's lower body while demonstrating the workings of a volcano.

The B.C. Teacher Regulation Branch says David Thomas Hobbs admitted to the incident in February of 2009 when he was giving a science lesson on rock formations to his Grade 7 class.

Hobbs got a female student to lie on her back on some desks with her legs bent and said words to the effect that "you are the rock and I am the lava, the hot stuff," before demonstrating the movement of lava by rubbing her legs from her calves to her buttocks.

While Hobbs said he didn't recall touching the student that way, a report by the branch says the student was brought to tears by Hobbs' actions.

Hobbs also had three male students lie on top of one another before he squatted on them to demonstrate the impact of pressure on a bottom layer of rock.

The branch says Hobbs has now agreed to have his teacher's certificate cancelled and he's promised not to seek a new job inside or outside B.C. that would involve teaching students under the age of 18.

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