Introducing KNOVA — A free reading app with curriculum-aligned passages on History & Science for Grades 3-8Learn More →

What is an Estuary? — Reading Comprehension

No ratings yet

Premium Resource

Grades

Rate this resource

Send Feedback / Report an Issue

About This Reader

This science passage introduces students to estuaries, unique ecosystems where freshwater and saltwater meet. Students learn about the structure and function of estuaries, including how tides, sediments, and water flow shape them. The passage highlights their importance as nurseries for fish, feeding grounds for birds, and natural filters that trap pollution. It also explains how estuaries protect coastal communities from floods and storm surges, while providing food resources like oysters and crabs. Fun facts make the passage engaging for learners. This resource aligns with NGSS standards for Life Science: Structure and Function, supporting students in understanding how living things depend on specific environments. Integrated audio features allow learners to listen along, improving accessibility and comprehension. Keywords include estuary, river meets ocean, estuary ecosystem, NGSS Life Science, and structure and function. At around 300-350 words, this resource is ideal for middle-grade science classes studying ecosystems and the connection between structures and functions in nature.

CONTENT PREVIEW

What is an Estuary?

An estuary is a special place on Earth where a river meets the ocean. In an estuary, the fresh water from the river mixes with the salty water from the ocean. This mixing creates brackish water. Brackish water is not as salty as ocean water, but not as fresh as river water. Estuaries often look muddy, with tall green grasses and plants growing on the shores. The air usually smells salty, and you might hear squawking birds or see small crabs scurrying along the mud.

Estuaries are sometimes called nature’s nursery or the ocean’s kindergarten. This is because many animals start their lives here. Baby fish, shrimp, and crabs all grow up safely in estuaries before swimming out to the open sea. The muddy bottom and tall plants give them places to hide from bigger animals that might want to eat them.

Estuaries are also important for birds. Migrating birds, like herons and egrets, stop in estuaries to rest and find food. The rich mud is full of worms and tiny creatures for birds to eat. Other animals you might find in an estuary include oysters, dolphins, and even otters. Many of these animals can only live in estuaries or wetlands.

Estuaries are a type of wetland. Wetlands are areas that are wet for all or part of the year. Wetlands like estuaries help keep our planet healthy. They filter dirt and pollution from water before it reaches the ocean. Estuaries also protect the land from big storms by soaking up extra water so towns and cities don’t flood easily.

Sadly, people sometimes harm estuaries by polluting them or building on them. Protecting estuaries is important because they are home to many animals and help keep our water and land healthy.

Interesting Fact: Some of the world’s biggest cities, like New York and San Francisco, are built next to estuaries!

What is an estuary?

Where river meets oceanA mountain topA desert lakeA rain forest

What kind of water is in estuaries?

Brackish waterOnly salt waterOnly fresh waterDirty water

Why are estuaries called nature’s nursery?

Many baby animals grow thereIt smells nicePeople swim thereIt has big mountains

How do estuaries help during storms?

Soak up extra waterMake storms strongerBring more rainBlock the sun

Which animal might you see in an estuary?

HeronCamelPenguinPolar bear

What happens if estuaries are polluted?