Here's why:
* Asthenosphere: This is a layer within the upper mantle. It's characterized by being partially molten, making it less dense than the surrounding solid mantle rocks. Its density is roughly 3.3 g/cm³.
* Earth's Core: The core is composed primarily of iron and nickel, with a small percentage of lighter elements. Its density is significantly higher than the asthenosphere, reaching around 10-13 g/cm³ in the inner core and around 9-12 g/cm³ in the outer core.
In summary: The Earth's core is significantly denser than the asthenosphere due to its composition of heavy metals. This density difference is crucial for understanding the Earth's internal structure and processes like plate tectonics.
