Q: -  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 -   What might be the first step of the process?
A: Acid rain makes waters acidic

Q: -  The water comes into contact with the rock below - The rock over the years carves through the rock - The space in the rock becomes larger and forms into a cave - As more rather rushes through the cave becomes a cavern.  What might be the first step of the process?
A: Water from the surface seeps below the soil

Q: -  The animal finds or builds a suitable place to hibernate where they can stay warm and protected - The animal moves into their den - Their heart rate and breathing slow down to conserve energy - They emerge from the den when the weather is warming up again.  What might be the first step of the process?
A: An animal eats a lot of food to fatten up

Q: -  The lungs remove oxygen from the air - Oxygen diffuses from alveoli in the lungs to the bloodstream - Hemoglobin in red blood cells attaches to the oxygen - Red blood cells carry oxygen all around the body - Oxygen diffuses into cells from capillaries.  What might be the first step of the process?
A: