Because the river want to turn 180 degree.
when a river winds back and forth, it is called meandering
AC (alternative current) goes back and forth (the flow of the current changes periodically) DC (direct current) has a continuous flow
into a river which goes to a collection/storage
A swing, a pendulum, or a conversation are some examples of things that go back and forth constantly.
yes it will as the water from the ocean goes back to the sea it will take a little by little as it travels back and forth to the ocean and shore
it goes back and forth
a grin
When the same person hits the ball twice in a row, it is called a double hit.
it goes back and forth on a string and amuses people
a grin
if it goes back and forth 2x in 5 seconds, 50 times that is 50x5 or 250 seconds, aka 3 min 10 sec
Space shuttles are called shuttles because they are designed to transport astronauts and cargo between Earth and space in a back-and-forth manner, resembling the shuttle-like movements. They can "shuttle" back and forth multiple times, unlike one-time-use rockets.