wow is a map showing the Bouguer anomalies associated with South America and the surrounding ocean basins. 15' D 0' -15' -30' 400 -200 -0 -45' -200 --400 mGal -90" -75' -60" -45' -30' a. Why do the Andes mountains have negative Bouguer anomalies? Include in your answer both the effect of the corrections made to obtain the Bouguer anomalies and the subsurface properties that produce the Bouguer anomalies. negativeb. Why do the ocean basins have positive Bouguer anomalies? Include in your answer both the effect of the corrections made to obtain the Bouguer anomalies and the subsurface properties that produce the Bouguer anomalies. anomaly because the