Here's a breakdown:
* Downward push of continents: Continents are less dense than the underlying mantle. This means they exert a downward force, like a giant, floating iceberg.
* Upward mantle: The mantle is denser than the crust. It pushes upwards, supporting the continents.
Isostasy is the balance between these two forces. Think of it like a seesaw: the continents are on one side, and the mantle is on the other. The seesaw is balanced when the forces are equal.
This concept explains various geological phenomena, such as:
* Mountain formation: When mountains form, they exert more downward force. The mantle responds by pushing back up, creating a "root" of denser material beneath the mountain.
* Glacial rebound: When glaciers melt, the weight they exerted on the land is removed. The land then slowly rebounds upwards, as the mantle pushes back up.
Let me know if you have any more questions about isostasy!
