What was new zealand the first country in the world to do? a. become part of the european union b. achieve independence peacefully c. legally recognize women's right to vote d. enter the fighting in world war ii

Tides are caused by a differences in the gravitational force of the sun at different points on earth. differences in the gravitational force of the moon at different points on earth differences in earth’s gravitational field strength at different points on earth’s surfac fluctuations in the gravitational attraction between earth and the moon.