What is the difference between continental crust and oceanic crust in regards to their thickness and densities?

The largest gulf in the world is a. gulf of mexico b. persian gulf c. gulf of carpentaria d. gulf of mannar the land-sea distribution or the positions of the world's continents and major oceans influences a. the major pressure belts that develop from the general circulation of the atmosphere b. the development of the mid-latitude cyclonic depressions, at the convergence zone between polar and subtropical air masses c. both (a) and (b) d. none of the above the knowledge about the topography of the ocean basins has been derived from a. seismic surveying b. echo sounder c. side-scan sonar d. all of the above