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Ocean Currents Chapter 16.1.

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Presentation on theme: "Ocean Currents Chapter 16.1."— Presentation transcript:

1 Ocean Currents Chapter 16.1

2 Ocean Currents Masses of ocean water that flow from one place to another.

3 Currents Two types of ocean currents: Surface currents Deep currents

4 Surface Currents Currents that ONLY move horizontally in the UPPER part of the Oceans surface Develop from friction between the ocean and the wind that blows across the surface.

5 Color your surface current map using the Key on your Surface Current Map! BLUE = Cold Current RED = Warm Current

6 Global Winds Create Currents Draw and Label a Global Winds Diagram according to this diagram.

7 Gyres Huge circular-moving current systems that are driven by the global winds. 5 main gyres!

8 Gyre Plastic Pollution

9 What if this was YOUR home?

10 Locate the 5 main Gyres on your surface current map
Locate the 5 main Gyres on your surface current map. Label the Gyres on your map

11 The Coriolis Effect Video Explanation
The deflection of the currents from their original course because of the Earth’s rotation. Just like a merry go round!

12 Because the Earth Spins
Currents are deflected: To the Right in the Northern Hemisphere To the Left in the Southern Hemisphere

13 Why? Great Britain and Alaska are at similar latitudes, yet Great Britain is about 25 degrees warmer than Alaska…

14 Ocean Currents and Climate
Gulf Stream is a great example of bringing warmth to a high latitude. It brings heat from the equator region to areas more North and South

15 Deep Currents VERTICAL (up and down) currents of ocean water
Caused by differences in water density Dense water SINKS LESS dense water RISES

16 Color in your Global Conveyor Belt diagram
Deep Currents A result of temperature or salinity changes temp = sinks salinity = density sinks Color in your Global Conveyor Belt diagram

17 Color in your Global Conveyer Belt Map Cold = Blue Warm = Red

18 Tides Chapter 16.2

19 What is a Tide? The rise and fall of the sea level.

20 The gravitational pull of the Moon and the Sun make the tides

21 Sun Vs. Moon The Sun is much larger than the Moon but has ONLY about ½ of the power of the Moon on tides WHY? Because the Moon is Closer

22 Types of Tides Two types of tides: Spring Tides Neap Tides


24 Spring Tides The Sun, Moon and Earth are in a straight line.

25 Spring Tides Come once every two weeks.
During a full and new moon phase

26 Spring Tides Highest High Tides and Lowest Low Tides Why?

27 Spring Tide ALL Gravitational Force!!

28 Neap Tides When the Sun Moon and Earth are at right angles.

29 Neap Tides Happens about twice a month
Happens at the 1st and 3rd quarter Moon Phase

30 Neap Tides Tidal Range is the smallest. (NOT MUCH DIFFERENCE between high tide and low tide!) Why?

31 Neap Tide Forces TWO different forces Gravitational and Centrifugal

32 Spring Tide vs. Neap Tide
In the boxes at the bottom of your notes Spring Tide vs. Neap Tide Neap Tide Force is from two directions at the same time Spring Tide Force is all in one direction HIGHEST HIGHS & LOWEST LOWS LOW HIGHS & HIGH LOWS


34 Tide Animations
How Tides Work Time Lapse High Tide The Bay of Fundy

35 One Tidal Cycle = 24 hours & 50 minutes
There are usually two high tides and two low tides each day.

36 Why the extra 50 minutes? As the Earth is rotating and revolving the Moon is revolving as well. It takes an extra 50 minutes for the Earth to catch up with the Moon.

37 Tidal Cycles – 3 types

38 Diurnal Tidal Cycle One high tide and one low tide per tidal cycle.

39 Semidiurnal Tidal Cycle
2 identical high tides and two identical low tides per tidal cycle

40 Mixed Semidiurnal Tidal Cycle
2 High and 2 Low tides – all of different heights.

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