For the first question about how Amazon Web Services cools down its data centers, the most applicable natural process from the provided options is Evaporation. This process involves using water to absorb heat and cool the environment, which is a common method in data center cooling technologies.
For the second question regarding automatic responses to protect data during events like flooding or a fire, the correct term is sensors. These devices can detect changes in environmental conditions and trigger automated safety measures to protect the hardware and data.