The Earth as a Philosophers Stone

Tonight at snack-time the conversation became geologically technical.
My 9yr-old boy (9 years old...Oh my = is he a "tween' now...?) decided to inform his 5 year old sister about the Earth.
He used such phrases as -
"You would think," and "But in reality,"
Pretty impressive in their own right.
But for those of you with children, you know that the rest of it was skewed.
Right? Right~!
He related a tale of how the Earths crust is where the grass grows, the Mantle; a subterranean mass of hot molten lava, and the core? That is obviously a sphere of solid metal. He went on to inform her that the core is composed of iron, nickel and other minerals.
Naturally, she asked if pennies and quarters came from Earth's crust too.
"Not the coins themselves," he informed her, "just the minerals they are made of."
"Gosh!" she said, dutifully impressed.
"Yea, wouldn't it be great," I could tell he was on roll now; he was in the spotlight (with his audience of one), "if the minerals of nickels and other money rotated up through the magma, and we made it into coins?"
At this point I probably should have made a correction or two, but they were so involved and so animated, I didn't think it right to stop them. Shortly, they had basically described the precipitation process (how water evaporates, becomes clouds, rains, evaporates, etc), only using minerals that form coins. Nothing else...just coins.

Actually, I was very impressed with their imagination. It was...rather hypnotic, and as Leonardo DaVinci was credited for saying "The Earth supplies us with everything we need at the price of labor."

...here endith the blog...