According to the diagram of the water cycle, what happens to the water in the oceans before it becomes water in the atmosphere?

Evaporation.

Explanation:

The water cycle or hydrological cycle is a circular cycle which has no starting point. This cycle involves three processes evaporation, condensation and precipitation. The water cycle is driven by the Sun.

Most of Earth's water exists in oceans, the sun heats water in the oceans. As a result of heating some of the water changes into vapours. This change of state is called evaporation.

The vapour goes into the air and it rises where cooler temperatures cause vapour to condense into clouds.

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