The appearance of the surface of a mineral when it reflects light is known as

The formation of a solid, also known as a is an indication of a chemical change. precipitate particulate particle powder

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

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?