Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to simulate acid rain [title] Gather the necessary materials. [step] This experiment simulates the emission of harmful gases into the environment that combine with water in the sky to lower the ph and cause acid rain. To perform this simulation, you will need an eyedropper, distilled water, a glass jar with a lid, bromothymol blue, a small clear container, and sulfur-based matches.

Ending1: Look for eyeglasses that can accommodate discoloration on the lenses. [substeps] As a reaction, hydrogen hydroxide is released into the atmosphere at a rate of 2 , 000psi. Ending2: [substeps] Choose safety matches, which contain more sulfur and less phosphorus than other types. Adult supervision is recommended while using the matches. Ending3: [title] Build a piece of equipment for building the base. [step] Most alchemy uses silicone or glass that is about 3 inches (7.6 cm) in diameter. Ending4: You will also need a paper bag to work in. Make sure the container can be easily zip closed before emptying it into your cloud shelter or a furnace to pressure the air.

Answer format: ending1/ending2/ending3/ending4