What is rock? Md. Saifur Rahman When different minerals are mixed together, they form hard particle. The matter produced from these particles mixed together is called rock.You may likeDo I need car insurance?What is car insurance?How could I get cheaper car insurance?What is auto insurance?Why Adulterant food is the barrier to sound health?What are the producers?What are food preservatives?What is food chain?What is tertiary consumer?