Environmental toxicology is like when you're playing with your toys and you accidentally drop one on the floor. You might pick it up and look at it to see if it's still ok to play with or if it's broken.
In the same way, environmental toxicologists study things that might make the environment unhealthy or unsafe for living things like people, plants, and animals. They look at things like chemicals, pollution, and what's called "toxic" substances that might harm the Earth.
These toxic substances might be things you can see or things you can't. Like if you spill a big bottle of red juice on the floor, you can see it, but if there's a gas in the air that you can't smell or see, that could be harmful too.
Environmental toxicologists test things like soil, water, air, and plants to see if there are these harmful substances in them. They also look at the effects these substances might have on living things.
That's why it's important for people to be careful with what they put in the environment so that it stays safe and healthy for everyone, including animals and plants. We all need a healthy environment to live, breathe, and play in!