scientists classify rocks into three different types. what is the main basis for the classification system they chose?

a. color of the rock
b. shape of the rock
c. how the rock formed
d. who discovered the rock

Your town is considering building a biodiesel power plant describe at least two advantages and two disadvantages

Water is siphoned from a large tank and discharges into the atmosphere through a 50-mm diameter tube. the end of the tube is b = 2.1 m below the tank bottom which is a = 7.4 m deep, and viscous effects are negligible. determine the maximum height h over which the water can be siphoned without cavitation occurring. atmospheric pressure is 101.4 kpa, and the water vapor pressure is 1.79 kpa (absolute)

An electromagnet is a device in which moving electric chargers in a coil of wire create a magnet.whats one advantage of using electromagnetic in devices