Understanding Ocean Currents and Models

In this lesson, students explore how prevailing winds and continents influence ocean currents. The teacher, along with helpers, conducts three missions using a model to demonstrate these effects. The first mission creates a gyre, the second attempts a non-gyre current, and the third increases current speed. Key concepts include the role of prevailing winds and continents in determining ocean current directions.

What materials are needed for the current tank investigation?

• A metal spoon and salt

• A plastic bottle and sand

• A deep metal container and sugar

• A straw, ground pepper, and a shallow waterproof container

What is the purpose of using models in scientific investigations?

• To simplify complex theories

• To replace real-world experiments

• To learn about things that cannot be observed directly

• To directly observe phenomena

What does the water in the model represent?

• The atmosphere

• The ocean

• The wind

• The land

What safety precaution is emphasized during the experiment?

• Wear gloves at all times

• Do not share straws to avoid spreading bacteria or viruses

• Use only metal straws

• Keep the container covered

In Mission 1, what is the goal of the experiment?

• To create a straight-line current

• To make the water evaporate

• To form a gyre, a circular ocean current

• To stop the water from moving

What adjustment helped create a single gyre in Mission 1?

• Using a larger container

• Moving the straw to one side

• Blowing harder

• Adding more water

What was the challenge faced in Mission 2?

• Creating a gyre

• Forming a non-gyre current

• Increasing the water temperature

• Reducing the water level

Why did the model tend to form gyres in Mission 2?

• The container was too small

• The straws were too short

• The water was too cold

• The walls of the container acted like continents

What technique was used in Mission 3 to increase the current speed?

• Blowing along the edge and increasing wind speed

• Using a larger straw

• Adding more water

• Reducing the amount of pepper

What key concept was highlighted at the end of the lesson?

• Prevailing winds and continents determine ocean current direction

• Continents have no impact on ocean currents

• Ocean currents are random

• Ocean currents are unaffected by wind