The ocean level rises when global temperature rises, due to ____________________. A) Both of these.B) Neither of these.C) melting of ice caps at the poles.D) thermal expansion of water

I was a bit surprsed to find the answer as (A). http://www.reuters.com/article/2012/02/08/us-climate-sealevels-idUSTRE8171RH20120208

Ice caps that are floating while melting do not raise the water level, but melting ice shelves and glaciers on land do raise the level. Thermal expansion throughut all the world's warming oceans also contributes significantly.

The correct answer is option A) Both of these.

Explanation: When the global temperature rises, there are two main factors that contribute to the rising of ocean levels: the melting of ice caps at the poles and the thermal expansion of water.

Melting of ice caps at the poles: As the global temperature increases, it leads to the melting of glaciers and ice caps present in the Arctic and Antarctic regions. This melted ice then flows into the oceans, causing the sea levels to rise.

Thermal expansion of water: When water is heated, it expands. So, as the global temperature rises, the temperature of the oceans also increases. This causes the water molecules to move faster and take up more space, resulting in the expansion of the volume of water. This expansion leads to a rise in sea levels.

Therefore, the rising of ocean levels when the global temperature rises is a combination of both the melting of ice caps at the poles and the thermal expansion of water, making option A) Both of these the correct answer.