Problem: What is the missing first step of the following process: - Causes them to absorb aluminum from soil - The water runs off from the soil into lakes, streams, etc - Fish and their eggs die - Frogs and plants die - Insects and other wildlife die - The ecosystem is out of balance, causing further problems -

A: Acid rain makes waters acidic

Problem: 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

Problem: What is the missing first step of the following process: - You must draw up a plan to what kind of orbit the satellite will travel - You make preparations for the rocket that will travel into space - Prepare the crew that will send it there - You begin the countdown date for the rocket - And then you send the rocket carrying the satellite into space - Once in orbit the satellite will be placed where it was planned.

A: You must decide the purpose of the satellite

Problem: What is the missing first step of the following process: - The sediments become glued together - The glued together parts become hard like cement - The sediment becomes a big rock - The rocks erode slowly - The rocks come apart - The rocks become smaller rocks - The rocks continue to erode into smaller rocks - The process starts again.

A:
Minerals fill spaces between bits of sediment