This link should help you understand http://www.universetoday.com/20289/phases-of-the-moon/#
Answer:
Ball-and-stick models show the bonds between atoms, but not the relative sizes of atoms. Space-filling models show the relative sizes of atoms, but not the bonds between atoms.
The step of the scientific method being described in the example is collecting and observing the data. This is an important part of the experiment, as it is going to be the basis of the analysis and conclusion. This is where the actual application of the hypothesis is going to reflect on. The data noted by the observer should be accurate and genuine.
The ocean holds about 97% of the Earth's water. So I'm guessing it's the ocean.
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