Identify the longitude lines visible in the image. Image text: 120, 130, 140, 150, 160, 180

The longitude lines visible in the image are 120, 130, 140, 150, 160, and 180 degrees. Explanation: The numbers '120', '130', '140', '150', '160', and '180' are marked along the vertical grid lines, which represent lines of longitude (meridians).