The Movement of Ocean Water

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# The Movement of Ocean Water - PowerPoint PPT Presentation

The Movement of Ocean Water. Chapter 14 Section 1. Bellringer. Imagine you are stranded on a desert island. You stuff a distress message into a bottle &amp; throw it into the ocean. Is there any way to predict where your bottle may land?. Bellringer.

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### The Movement of Ocean Water

Chapter 14 Section 1

Bellringer
• Imagine you are stranded on a desert island. You stuff a distress message into a bottle & throw it into the ocean.
• Is there any way to predict where your bottle may land?
Bellringer
• Is there any way to predict where your bottle may land?
• Yes, ocean water contains stream-like movements of water called currents. These currents are influenced by a number of factors.
Currents

Objectives

• Describe surface currents.
• List the three factors that control surface currents.

Chapter 14

Section1 Currents

One Way to Explore Currents

• Ocean water contains streamlike movements of water called ocean currents.
• Norwegian explorer Thor Heyerdahl proved his theory that ocean currents influenced human migration by using a raft that was powered only by wind and ocean currents.

Chapter 14

Section1 Currents

Surface Currents

• Horizontal, streamlike movements of water that occur at or near the surface of the ocean are called ocean currents.
• Surface currents are controlled by three factors: global winds, the Coriolis effect, and continental deflections.

Chapter 14

Section1 Currents

• Global Winds: Winds that blow across the Earth’s surface create surface currents in the ocean. Different winds cause currents to flow in different directions.
• The Coriolis Effect is the apparent curving of moving objects from a straight path due to the Earth’s rotation.

Chapter 14

Section1 Currents

• Continental Defections: When surface currents meet continents, the currents deflect, or change direction.

Chapter 14

Section1 Currents

Surface Currents, continued

• Taking Temperature Currents are also affected by the temperature of the water in which they form.
• The next slide shows Earth’s surface currents. Warm-water currents are shown as red arrows, and cold-water currents are shown as blue arrows.

Chapter 14

Section1 Currents

Currents

Objectives

• Describe surface currents.
• List the three factors that control surface currents.