Why does the eldest magician ask the fisher of the sea to create the tides

the sun warms our planet, and with the moon, creates the tides. the moon orbits the earth and in turn, the earth orbits the sun. because they appear to be the same size in the sky, the sun, earth and moon work together to create eclipses. when the moon is directly in between the earth and sun

i dont know i didnt take the test

following gollum to the back entrance