Why does the text make a comparison to the state of Texas? to develop the focus of the information with an awareness of the particular geographic region around the Great Pacific Garbage Patch to enable a clear understanding of the expansive size of Texas by using the Great Pacific Garbage Patch as a model to provide a perspective of the square mileage of the Great Pacific Garbage Patch with a recognizable area of comparable size to show how far the Great Pacific Garbage Patch extends below the surface of the ocean by demonstrating its depth