Chapter 18: Ocean Motion - PowerPoint PPT Presentation


PPT – Chapter 18: Ocean Motion PowerPoint presentation | free to download - id: 7efa2c-NzVmZ


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation

Chapter 18: Ocean Motion


Chapter 18: Ocean Motion Section 18-2 Ocean Currents Notes Guide Surface Currents Ocean currents are a mass movement, or flow, of ocean water. Currents are like ... – PowerPoint PPT presentation

Number of Views:59
Avg rating:3.0/5.0
Slides: 13
Provided by: marparsons
Learn more at:
Tags: chapter | layer | motion | ocean


Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Chapter 18: Ocean Motion

Chapter 18 Ocean Motion
  • Section 18-2 Ocean Currents Notes Guide

Surface Currents
  • Ocean currents are a mass movement, or flow, of
    ocean water. Currents are like rivers within the
  • Surface currents move water horizontally-parallel
    to the Earths surface.
  • These currents are powered by wind, which forces
    the ocean to move in huger circular patterns.
  • The currents on the oceans surface are related
    to the circulation of the winds on Earth.
  • Surface currents move only the upper layer of

Ocean Surface Currents
How surface currents move
  • Surface ocean currents and winds are affected by
    the Coriolis Effect.
  • -the Coriolis Effect is the shifting of winds
    and surface currents from their expected paths
    that is caused by Earths rotation.
  • -Because the Earth rotates toward the east,
    winds appear to curve toward the right in the
    northern hemisphere and to the left in the
    southern hemisphere.
  • -the winds cause the water to pile up in parts
    of the ocean. When gravity pulls the water off
    the pile, the Coriolis effects turns the water.
  • -Surface water in north of the equator turns to
    the right, and currents south of the equator turn
    to the left.

Coriolis Effect
How surface currents move continued
  • The Gulf Stream is a very strong current that
    brings warm water up from the equator, up the
    east coast of the U.S., and towards England.
  • -Sailors used the Gulf Stream to travel quickly
    from North America to England.
  • Surface currents are tracked by drift bottles.
  • These bottles are released in various locations.
    People record information about where and when
    the bottle was found, and scientists use that
    information to learn about surface currents.

Gulf Stream
Warm and Cold Surface Currents
  • Currents formed on the east coast of continents
    move warm water from the equator towards the
  • -The Gulf Stream is an east coast current.
  • Currents formed on the west coast bring cold
    water down from the poles toward the equator.
  • - The California Current is a west coast
  • Currents play a key role in distributing heat
    across the globe, and this transfer of heat
    influences climate.

  • Upwelling is a vertical circulation in the ocean
    that brings deep, cold water from the ocean
    bottom to the ocean surface.
  • Wind blowing parallel to coasts carries the water
    away from land. That warm surface water is then
    replaced by cold, deep ocean water.
  • Water from the deep ocean is rich in nutrients
    that come from dead and decayed organisms.
  • This nutrient rich water encourages plankton
    growth, which in turn attracts fish.
  • Areas of upwelling are important fishing grounds.

Density Currents
  • Deep in the ocean, water circulated because of
    density differences, not because of wind.
  • A density current forms when a mass of seawater
    becomes more dense than the surrounding water.
  • More dense water will sink below less dense
  • -Saltier water is more dense than fresh water.
  • - Cold water is more dense than warm water..
  • Density currents circulate ocean water slowly.

Oceanic Conveyer Belt