A marsh is like a big, squishy sponge that the Earth uses to soak up water. Imagine when you spill a drink and use a sponge to clean it up. The sponge gets wet but still holds the water. A marsh does the same thing for rainwater. It has lots of plants like tall grasses and small bushes that love to drink up water. These plants help keep the water clean, just like a filter.
Think of a marsh as a giant salad bowl full of water and plants. The water in the marsh is not too deep, so plants can grow easily. Frogs, birds, and insects love to live here because there are lots of places to hide and food to eat. The marsh is a cozy home for them, like how your bed is a cozy place for you.
A marsh is also like a big, muddy playground. The ground is soft and squishy, and sometimes your feet might sink a little if you step in it. This squishy soil is perfect for plants and animals to play and live in. The marsh helps other places by stopping floods, just like a superhero stopping a big wave from crashing into a city.