---
title: "What Is the Ocean?"
description: "Know that oceans are huge bodies of salt water that cover most of Earth's surface, and that the ocean is home to an enormous number of living things"
canonical: https://lightmysky.com/learn/science/what-is-the-ocean-mt_oAg79ju344
source: https://lightmysky.com/learn/science/what-is-the-ocean-mt_oAg79ju344.md
retrieved: 2026-10-19
---

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# What Is the Ocean?

Know that oceans are huge bodies of salt water that cover most of Earth's surface, and that the ocean is home to an enormous number of living things

Subject: Science · Area: Ocean Life · Ages 5 to 7
Page: https://lightmysky.com/learn/science/what-is-the-ocean-mt_oAg79ju344

## Ready when they can

- State that oceans cover more of Earth than land does
- Explain that ocean water is salty, while many rivers and lakes have fresh water and some lakes are salty
- Describe the ocean as home to a huge variety of living things

## Lesson: What Is the Ocean?

On many globes and world maps, blue shows water. Most of that blue is ocean. The ocean covers more of Earth's surface than land.

*(drawing: The bars show roughly 7 parts ocean to 3 parts land. Ocean covers more of Earth's surface.)*

**Example.** Mia visited the beach with her mom. Mom explained that ocean water is salty. Mia's cup at home held fresh water. Ocean water is not for drinking.

**Tip.** Many rivers and lakes have fresh water. Some lakes are salty. Ocean water is salty, so we do not drink it.

The ocean is home to many living things. Fish, whales, crabs, and coral all live there.

**Recap.** The ocean is huge, salty, and full of life. It covers more of Earth than land does.

## Practice

8 questions on this page, each with its working shown.

## Opens up

- [The Five Oceans](https://lightmysky.com/learn/science/the-five-oceans-mt_8QOeG3CuKc)
- [Tides, Waves & Currents](https://lightmysky.com/learn/science/tides-waves-and-currents-mt_kCSy3Lsgme)
- [What Ocean Animals Need](https://lightmysky.com/learn/science/what-ocean-animals-need-mt_m31_gPS8F1)
- [Ocean Depth Zones](https://lightmysky.com/learn/science/ocean-depth-zones-mt_sQpIV0-qY7)
- [The Ocean Floor](https://lightmysky.com/learn/science/the-ocean-floor-mt_yxL1v4LuqR)