Why isn’t the level of water in aquifer always the same?

The frequency of a given region of the electromagnetic spectrum ranges from 3 × 1016 − 3 × 1019 hertz. which type of wave is found in this region? a. x-rays b. ultraviolet rays c. infrared waves d. radio waves

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

Ways that industry and agriculture use physical properties to separate substances