Earth has land and water, and both are important parts of our world. Land is where we find mountains, forests, rocks, soil, and many homes for plants and animals. Water covers most of Earth and fills oceans, lakes, rivers, and ponds.
Learning about land and water helps children understand where living things find food, shelter, and space to grow.
Oceans are the biggest bodies of water on Earth, and they are home to many animals like fish, whales, crabs, and sea turtles. Land can be dry, rocky, sandy, flat, or tall, and different animals live in different places. Water and land also work together because rain falls on land and flows into rivers and oceans.
When children compare land and water, they begin to notice patterns in nature and how Earth fits together.
Understanding Land and Water
Earth’s surface is always changing, even when it seems still. Wind can carry tiny bits of sand and soil from one place to another. Rain can loosen rock on a hillside.
Flowing water picks up small pieces of rock, called sediment, then leaves them behind when it slows down. Over a long time, these changes can shape valleys, beaches, riverbanks, and deltas. Waves wear away some coasts while building up sand in other places.
Ice can scrape and carve land as glaciers move slowly. Most of these processes take far longer than a human lifetime, so scientists study rocks, layers of soil, and land shapes for clues about the past.
Not all water on Earth is useful for drinking. Ocean water contains dissolved salts, so it is called salt water. Water in most rivers, lakes, ponds, and streams is fresh water, although it can still contain mud, minerals, or tiny living things.
Fresh water is a small part of all the water on Earth. Much of it is frozen in ice or stored underground.
People depend on available fresh water for drinking, growing crops, washing, and making electricity in some places. Keeping rivers and lakes clean matters because pollution can travel downstream and affect people, animals, and plants far from where it began.
A watershed is an area of land where rain and melting snow drain toward the same stream, river, lake, or ocean. High ground, such as hills or ridges, often forms the edge between watersheds. A drop of rain that lands on one side of a ridge may flow into a different river from a drop that lands on the other side.
Some water soaks into the ground and becomes groundwater. Plant roots help hold soil in place and slow moving water.
When many trees or grasses are removed, rain may carry away more soil. This can make water muddy and can increase flooding after heavy rain.
Maps and globes help students see how land and water are connected across large distances. Blue usually shows water, while green, brown, or yellow often shows different kinds of land. A map key explains what symbols and colors mean.
Contour lines on some maps show changes in height. Lines close together usually show a steep slope, while lines farther apart show gentler land.
In daily life, these ideas appear when people choose safe places to build homes, plan roads, visit beaches, or prepare for floods. When observing a local park, creek, or shoreline, pay attention to where water collects, which way it moves, and how the ground changes near it.
Key Facts
- Land is the dry part of Earth where people, trees, and many animals live.
- Water covers more of Earth than land does.
- Oceans are very large bodies of salt water.
- Rivers move water across land into lakes or oceans.
- Some animals live on land, some live in water, and some use both.
- Sand, rocks, soil, shells, waves, and clouds are all parts of Earth's land and water places.
Vocabulary
- land
- Land is the dry ground on Earth where we can walk, build, and grow plants.
- water
- Water is the wet part of Earth found in oceans, lakes, rivers, and rain.
- ocean
- An ocean is a huge body of salt water.
- river
- A river is water that moves across the land.
- shore
- A shore is the place where land meets water.
Common Mistakes to Avoid
- Thinking all water is ocean water, but this is wrong because lakes, ponds, rivers, and rain are water too and they are not all salty.
- Thinking all animals live only on land or only in water, but this is wrong because some animals, like frogs and turtles, use both places.
- Calling every big piece of land a mountain, but this is wrong because land can also be flat, sandy, grassy, or rocky.
- Thinking the shore is only water, but this is wrong because the shore is where land and water meet together.
Practice Questions
- 1 A picture shows a tree, a rock, a fish, a boat, and a shell. Which 2 things belong in water habitats and which 3 belong on land or shore?
- 2 A child sorts 8 picture cards. There are 3 land animals, 3 water animals, and 2 things found at the shore. How many cards are not only land animals?
- 3 Why might a turtle need both land and water to live well? Explain using one reason for land and one reason for water.