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13. MOVEMENTS OF OCEAN WATER

Ocean water movement is influenced by physical characteristics such as temperature, salinity, and external forces like wind and gravitational pulls from celestial bodies. The movements are categorized into horizontal motions like currents and waves, and vertical motions like tides. Understanding these movements is essential for navigation and ecological health.

Sections

MOVEMENTS OF OCEAN WATER

This section discusses the dynamic movements of ocean water, including ocean currents, waves, and tides, focusing on how various factors influence them.

13 Section Overview

Start current section content and materials

13.1 WAVES

This section discusses the dynamic movements of ocean water, focusing on waves, their characteristics, formation, and the effects of tides on ocean levels.

13.2 TIDES

Tides are periodic rises and falls of sea level caused primarily by the gravitational pull of the moon and sun.

13.2.1 Tides of Bay of Fundy, Canada

The Bay of Fundy in Canada experiences the highest tides in the world, influenced primarily by the gravitational pull of the moon and sun.

13.2.2 Types of Tides

This section discusses the different types of tides based on their frequency and the positions of the Sun and Moon.

13.2.2.1 Tides based on Frequency

The section discusses the types of tides based on their frequency of occurrence, including semi-diurnal, diurnal, and mixed tides.

13.2.2.1.1 Semi-diurnal tide

Semi-diurnal tides are characterized by two high and two low tides every lunar day, with successive tides having similar heights.

13.2.2.1.2 Diurnal tide

Diurnal tides consist of a single high and low tide occurring each day, primarily influenced by the gravitational forces of the moon and to a lesser extent by the sun.

13.2.2.1.3 Mixed Tide

Mixed tides are characterized by variations in height, typically occurring along the west coast of North America and many Pacific islands.

13.2.2.2 Tides based on the Sun, Moon and Earth Positions

Tides are the periodic rise and fall of sea levels caused by the gravitational forces of the sun and moon on Earth.

13.2.2.2.1 Spring tides

The alignment of the sun, moon, and Earth in a straight line causes higher tides, known as spring tides, which occur twice monthly during full and new moon phases.

13.2.2.2.2 Neap tides

Neap tides occur when the sun and moon are at right angles to each other, resulting in lower tidal ranges compared to spring tides.

13.2.3 Importance of Tides

Tides are crucial ocean phenomena driven mainly by the gravitational pull of the moon and the sun, leading to predictable patterns that significantly affect navigation, coastal ecosystems, and even energy generation.

13.3 OCEAN CURRENTS

Ocean currents are dynamic movements of water influenced by primary and secondary forces, affecting temperatures and ecosystem dynamics.

13.3.1 Types of Ocean Currents

Ocean currents are continuous flows of water within the ocean, influenced by various forces and classified based on depth and temperature.

13.3.1.1 Major Ocean Currents

This section explores the dynamics of ocean currents, their causes, types, effects, and their distinctions from waves and tides.

13.3.1.2 Effects of Ocean Currents

Ocean currents influence oceanic climates, marine biodiversity, and human activities, driven by physical forces such as wind and solar energy.

13.4 EXERCISES

This section covers various exercises to enhance understanding of ocean movements, including waves and tides.

Learning Objectives

  • Ocean water movements are categorized into horizontal and vertical motions.

  • Waves are energy waves rather than water itself and are generated by wind activity.

  • Tides are caused by the gravitational pull of the sun and moon, leading to periodic rises and falls in sea level.

  • Ocean currents are streams of water within the ocean influenced by various forces and have significant effects on climate and navigation.

Key Concepts

Waves

Waves are energy transfer phenomena in the ocean, moving across the surface while water particles move in circular paths.

Tides

Tides are the regular rise and fall of sea levels caused by the gravitational forces of the moon and sun.

Ocean Currents

Ocean currents are directed flows of water in the ocean, influenced by wind, temperature, salinity, and the Earth's rotation.

Practice Exercises

Total Questions

6

Estimated Time

12 min

Passing Score

70%

Instructions

  • Read each question carefully
  • You can use hints if you need help
  • Complete all questions before submitting