What’s the crust made of? Besides dirt and rocks and the occasional buried treasure? It’s a surprisingly simple list of ingredients. Oxygen, silicon, aluminum, iron, and calcium are the headliners.
PPT - THE LAYERS OF THE EARTH PowerPoint Presentation, free download
In fact, oxygen takes up nearly half the crust by weight! You read that right—almost half of the solid ground you stand on is a gas you breathe. It’s trapped inside minerals like quartz and feldspar, but still—that’s a weird thought.
And don’t forget the little guys: tiny amounts of gold, silver, and platinum are sprinkled throughout. So technically, you’re never more than a few feet away from a microscopic speck of gold. Good luck finding it, though.
Bonus Fact: The Crust Is Bouyant (Like a Rock Boat)
Here’s a fun one: continents float! Not on water, but on the dense, squishy mantle below. It’s called isostasy, and it’s why mountains have deep roots.
Think of an iceberg—what you see above water is only the tip. Mountains work the same way: the taller they are, the deeper their crustal roots go down into the mantle. Everest? It’s got roots deeper than your last existential crisis.
So when you hike a mountain, you’re actually standing on a giant, rocky iceberg. Bring a jacket.
