31.On the map on page 9, highlight the mid-ocean ridge in the Elrond Sea and label it the Hobbit Ridge. 2.Draw a diagram and explainthe origin of the striped magnetic anomaly pattern visible in the Elrond Sea. 3.The pattern of positive and negative magnetic anomalies in the Elrond Sea can be correlated with the pattern ofnormal and reversed magnetism on the magnetic polarity time scale. Based on this correlation, how manymillion years (m.y.) ago did sea floor spreading begin in the Elrond Sea?
4.Using the magnetic anomaly pattern in the Elrond sea, determine the 1/2-spreading rate on the Hobbit Ridge(i.e., determine how fast the Frodo continent is moving away from the Hobbit ridge). Give your answer in mm/y(millimeters per year).