<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:  What causes the sky to appear blue? Context: The sky appears blue due to the scattering of sunlight by the Earth's atmosphere. Answer: [/INST]The scattering of sunlight by the Earth's atmosphere causes the sky to appear blue.</s>