What impact does thermal expansion have on sea levels?

• A. Decreases sea levels globally
• B. Contributes to rising sea levels
• C. Has no impact on sea levels
• D. Causes distinct areas of flooding

Answer: (B)

Thermal expansion contributes to rising sea levels due to the increase in ocean temperatures. As water heats up, it expands, leading to a rise in the volume of seawater. This process is particularly significant as global temperatures continue to rise due to climate change. The increased heat from the atmosphere warms the ocean, causing large bodies of water to expand. This effect is compounded by the melting of ice sheets and glaciers, which add additional water volume to the seas. Therefore, thermal expansion is a key factor in the ongoing rise of global sea levels, making it an important consideration in discussions about climate change and its impact on coastal regions and ecosystems.