Rocks and Minerals

What’s inside

• What is a mineral?
• Which rock forms when melted rock cools and hardens?
• Which rock commonly forms from layers of sediment?
• Which rock forms when an existing rock changes because of heat and pressure?
• What is the hardest mineral on the Mohs hardness scale?
• Which mineral is commonly used to make table salt?
• What is the main difference between a rock and a mineral?
• Which mineral is known for its glassy appearance and is common in many rocks?