In talking about igneous rocks, we looked at the
cards from teacherdesk.info and talked about how
some lava cools quickly (like obsideon) and some
cools slowly (like granite).
Melting wax from a candle was like lava cooling
quickly and after the wax had cooled for a few
moments we felt how smooth it was and compared
that to the obsideon rocks we have from the rock
kit.
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