The closest known star to our solar system is Alpha Centauri, which is approximately 4.30 light-years away. A spaceship with a c
onstant speed of 0.800c relative to the earth travels from Earth to this star. How much time would elapse during the trip on a clock on board the spaceship?
Working slowly over many years, groundwater travels along small cracks. The water dissolves and carries away the solid rock. This gradually enlarges the cracks.
If you're referring to streams/rivers of water that run independently of another source in the ocean these are referred to as "currents" and can be very powerful depending on their location.
