Here's a breakdown:
* Crust: The outermost, solid layer of the Earth, relatively thin and composed of different types of rock.
* Mantle: A thick layer of hot, dense rock that lies beneath the crust. It's made of silicate minerals and is mostly solid, but behaves like a very viscous fluid over long periods.
The mantle supports the crust in two ways:
1. Convection currents: Heat from the Earth's core causes convection currents within the mantle. These currents are like giant conveyor belts that move the mantle material in a circular motion. The rising hot mantle material pushes up on the crust, keeping it afloat.
2. Isostasy: This principle states that the Earth's crust floats on the denser mantle, similar to how an iceberg floats on water. Heavier parts of the crust, like mountains, sink deeper into the mantle, while lighter parts, like ocean basins, float higher.
So, it's not just one thing but a combination of factors involving the mantle's properties and the Earth's internal heat that supports the crust.
