Match the layer with its correct description. 1. inner core solid rock about 720 km thick that flows from plasticity. temperature is about 850°c. 2. outer core made of solid iron about 1,200 km thick. temperature is about 7,000°c. 3. lower mantle solid rock about 2,200 km thick. temperature is about 3,000°c. 4. upper mantle (asthenosphere) very dense liquid of iron and sulfur about 2,250 km thick. temperature is about 4,000°c. 5. crust (lithosphere) plates that average about 30km in thickness and 25°c in temperature.