Unit D: Cycles on Earth and in Space
Chapter 1: the water cycle
Chapter 1 Introduction
There's plenty of water on Earth. In fact, Earth is nearly covered with it. Most of the water on Earth is frozen or salty. And even though water seems to be everywhere, in some places on Earth there is almost no water at all.
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Chapter 1, Lesson 1: Where is Water Found on Earth?
Summary
More than two-thirds of Earth's surface is covered by water. Most of this water is the salt water of oceans and seas. Fresh water is found in lakes, ponds, rivers, and streams. Nothing could live on Earth without water. Click on the button below to watch and interact with a video. |
Chapter 1, Lesson 2: What is the Water Cycle?
Summary
Evaporation changes water from a liquid into a gas. Condensation changes water from a gas back into a liquid. The water cycle is the movement of water from Earth's surface into the air and back to the surface again. The water moves by evaporation and condensation. Click on the button below to watch and interact with a video. |
For Review
Click on the pictures below to learn more about weather.
Click on the pictures below to learn more about weather.