Which is characteristic of a mineral?
it must be naturally occuring and crystalline
it must be man-made and crystalline
it must be man-made and amorphous
it must be naturally occurring and amorphous

When light strikes a plane mirror, images form in locations where light does not actually reach. it only appears to the observer as though the light were coming from this position. what type of image is formed?

You have a liquid that exhibits diltancy. you want to pour it from a bottle. what should you do to the bottle before pouring

When a device is used in a circuit in which the voltage is 81 v the current flowing through the device is 3 a what is the resistance of the device