Q: What is the missing first step of the following process: - Rain picks up carbon dioxide as it falls to earth - The rain falls on the soil over the limestone - The carbon dioxide in the rain washes through the soil - The carbon dioxide turns into acid - The acid in the rain gets to the limestone below the soil - The acid dissolves the limestone - Acid continues to erode the limestone with more rain over time - The eroded limestone sometimes forms caves.
A: Limestone is located under the soil

Q: What is the missing first step of the following process: - The parent(s) incubate the eggs - The eggs hatch - The mother (and sometimes the father) bird take care of the baby birds - The baby birds grow up and get their flight feathers - The young birds learn to fly and leave the nest - The adult birds find mates and mate.
A: A bird lays eggs in a nest

Q: What is the missing first step of the following process: - Preheat the oven to desired baking temperature - Grease your preferred cake pan with crisco or butter or other non-stick spray - Add eggs and vegetable oil to the dry ingredients - Stir or whisk until all the dry flour has been absorbed - Pour the batter into the greased cake pan - Place cake pan into the oven for the required time - When a toothpick inserted into the cake comes out clean, the cake is done baking -
A: To bake a cake you first need to gather your ingredients

Q: What is the missing first step of the following process: - Attach a rocket - Add rocket fuel - Launch rocket - Satellite goes into orbit.
A:
Build a satellite