Raul's little sister Sarah wants to know why she can see herself in a mirror, but she can see through a window. What should Raul tell his sister to explain the difference between mirrors and windows?

Miner's coal distributors does not mine coal itself, nor does it even store or handle the coal. instead, miner's solicits orders for low sulfur coal from other firms, then purchases the required amount from suppliers and directs them to ship the coal to its customers. what is miner's