Read the text carefully and answer the question!

    Rain always comes from clouds. But where do clouds come from? How does all that water get into the sky?

    Think about your bathroom. There is hot water in your bath. Steam goes up from the hot water. The steam makes small clouds in the bathroom. These warm clouds meet the cold walls and windows, and then we see small drops of water on the walls and windows.

    The world is like your bathroom. The water in the oceans is warm when the sun shines on it. Some of this water goes up into the sky and makes clouds. The wind carries the clouds for hundreds of kilometres. Then the clouds meet cold air in the sky, and we see drops of water. The drops of water are rain.

    The rain falls and runs into rivers. Rivers run into oceans. And the water from oceans makes clouds and more rain. So water is always moving from oceans to clouds to rain to rivers to oceans. So the rain on your head was on other heads before! The water in your garden was in other gardens in other countries.

"The water in the oceans is warm when the sun shines on it."

The underline word in the third paragraph refers to ____