Does a rock have to minerals in it to be considered a rock?

When the river overflows it's banks it deposits material called? Where do the thermocline and an associated pycnocline form? Is a charaterists of actinides? Compare the energy values of a carbohydrate molecule versus a fat molecule? What is the charged particle? How many pennies in 12000? Does magnesium come in a liquid form? How can people save prairie dogs? Does something in space need to be spinning to have gravity? What is the amount of energy needed to raise 1 kg of a substances 1 c? What are the types of plant tropism describe and give example for each? What is patchy densities? Are p angles right angles from each other? What persent of glucose energy is used by cell in the form of ATP during a single aerobic glycolysis and why? Can excessive and prolong use of pesticides and insecticide deform the shape of orchid plant's growth? What are common causes of physical and chemical contamination and their effect on health? What are the two substances transported through phloem tissue? What makes one region different from another? What was the date of Thredbo landslide? What are three ways humans affect earth's system?