Erosion is the process by which something becomes eroded. Something is eroded by being worn away slowly over time, usually from the action of wind or running water. Even the hardest rock can slowly become eroded.
Erosion is a problem if it happens too fast, for example when trees and plants are removed by people and then all the good soil is washed away because there is nothing holding it together anymore.
Friction is a force that resists against two surfaces sliding across each other. The rougher the surfaces are the more friction they will encounter, and the smoother the surfaces the less friction there will be.
Friction is a very important force, and many of your day to day activities rely on friction. You walk around easily because of the friction between the ground and your feet. When you are on a low-friction surface like ice you will find it hard to walk, and you are likely to fall over.
The man in the picture is able to climb the rope because of the friction between his hands and the rope.
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Identification, or ID, is something you use to prove to other people that you are who you say you are. Most identification has a photograph of you on it. People generally carry some form of identification in their wallet.
Something is an imitation if it is a copy of something else. The picture is of some imitation gemstones, but you can also get imitation flowers and imitation flavors like vanilla essense.
You can also imitate a person by copying them, for example by moving the same way they do.
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When you give someone an injection you use a syringe to put some liquid into them through a small needle.
The person in the picture is being vaccinated.