Moon's Internal Structure
The Moon’s internal structure consists of several distinct layers. At its center lies a small, dense core made primarily of iron and nickel. Surrounding the core is a partially molten mantle composed of silicate rocks, which extends outward and influences lunar volcanic activity. The outermost layer is the crust, a solid, rocky shell covered with impact craters and maria. Together, these layers reveal the Moon’s geological history and its similarities to Earth’s structure.
Moon's Internal Structure
The Moon’s internal structure consists of several distinct layers. At its center lies a small, dense core made primarily of iron and nickel. Surrounding the core is a partially molten mantle composed of silicate rocks, which extends outward and influences lunar volcanic activity. The outermost layer is the crust, a solid, rocky shell covered with impact craters and maria. Together, these layers reveal the Moon’s geological history and its similarities to Earth’s structure.
💡 Key Takeaways
- Identify the Moon’s main internal layers: crust, mantle, and core.
- Explain how seismic and gravity data reveal the Moon’s interior.
- Describe how crust thickness differs between the nearside and farside.
- Summarize evidence for a small, partially molten lunar core.
- Compare the Moon’s interior to Earth’s and discuss implications for formation.
❓ Frequently Asked Questions
What are the main internal layers of the Moon?
The Moon's interior has a crust, a mantle, and a small iron-rich core. The crust is light-colored and rich in anorthosite, the mantle lies beneath, and the core is at the center with evidence for a partially molten outer region and possibly a solid inner core.
How do scientists determine the Moon's internal structure?
Apollo seismometers detected moonquakes and interior reflections; gravity measurements, topography, and rock samples also reveal layer boundaries and core size.
How thick is the Moon's crust, and does it vary across the surface?
Crust thickness varies: about 30–50 km on the near side and thicker on the far side; mare regions can be thinner where basalt fills basins.
Is the Moon's core liquid or solid?
The core is believed to be iron-rich with a partially molten outer part and possibly a solid inner core; the exact sizes and state are still debated.