Which of the following is not a mineral?

A. Natural diamond

B. Coal

C. Gold

The current in a stream runs at 5 miles per hour. if a boat can go 15 miles per hour on still water, how fast can the boat go downstream? upstream?

True or false one of the benefits of using an exercise ball is generally involves the core muscles?

What is the difference between a solar cell and a solar panels

Explain how "elastic potential energy" dramatically changed the sport of pole vaulting when flexible fiberglass poles replaced stiffer wooden poles.

On earth a rock is dropped and falls 4.9 meters just before it hits the ground. how much time did the rock take to fall this distance

Define the law of conservation of momentum in one sentence

A shopping cart rolls from x=19.9m to x=5.40m with an average velocity of - 0.418m/s. How much time did it take? (unit=s)

Where does the energy of a nuclear power plant come from?

When the vapor pressure of a liquid is equal to the atmospheric pressure the liquid?

Both high-side pressures and low-side pressures are low with the engine running and the selector set to the air-conditioning position. Technician A says that the system is undercharged. Technician B says the cooling fan could be inoperative.