Answer:
D. Liquid
Step-by-step explanation:
The fact that volcanoes exist shows that some parts of the Earth's interior must be hot enough — around 800 to 1,300 degrees Celsius — to melt rock and allow liquid magma to rise upward. This points to Earth having a partially molten, liquid layer within its interior. Seismic studies confirm there is indeed a predominantly liquid outer core inside our planet.