<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  How many layers does the Earth have? Context: The Earth has four layers: crust, mantle, outer core, and inner core. Answer: [/INST]The Earth has four layers - crust, mantle, outer core, and inner core.</s>