Chapter 4 – Earth’s Water

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Presentation transcript:

Chapter 4 – Earth’s Water Lesson 1 – Earth: The Blue Planet © Brent Coley 2009 | www.mrcoley.com

How much of Earth is covered with water? An ocean is a large body of salt water. About 70% of the Earth’s surface is covered with oceans.

How much of Earth is covered with water? Oceans provide: food (fish, shrimp) fuel (oil from ocean bottom) recreation & transportation The Pacific Ocean is the biggest and deepest ocean on Earth.

How much of Earth is covered with water? Fresh water contains little or no salt. Only 1% of Earth’s water is fresh water.

How much of Earth is covered with water? Most of Earth’s fresh water is frozen in Antarctica.

What makes oceans salty? Rain water falling on a mountain is fresh. As it flows downhill, it picks up salt from the soil and rocks. The water flows into tributaries (small streams or rivers).

What makes oceans salty? Tributaries flow into a larger river. The river flows into the ocean and drops off a small amount of salt.

“Mountain Water Flow” Science in Motion Video What makes oceans salty? Ocean waves pound on rocks and sand, picking up salt and adding it to the oceans. “Mountain Water Flow” Science in Motion Video

What makes oceans salty? Some ocean water evaporates, changing from a liquid to a gas (water vapor). As the water vapor rises out of the ocean, the salt stays behind, making the remaining water saltier.

All images courtesy of Microsoft Office Online.