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Geography – Fundamentals of Physical Geography

Water (Oceans)

Water (Oceans)

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Study Action Plan (Sorted by Difficulty)
Hydrological Cycle
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Difficulty Level:
High
Oceanic Relief Features
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Difficulty Level:
High
Salinity of Ocean Waters
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Temperature Distribution in Oceans
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Difficulty Level:
High

Learning Objectives

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Learning Objectives

  • Understand the processes involved in the hydrological cycle, including evaporation, condensation, precipitation, and runoff, and their significance in the earth's hydrosphere.
  • Analyze the major and minor oceanic relief features, such as continental shelves, slopes, deep sea plains, ridges, seamounts, and trenches, and their formation processes.
  • Examine the factors affecting temperature distribution in oceans, including latitude, land-water distribution, winds, and ocean currents, and understand the concept of the thermocline.
  • Investigate the factors influencing the salinity of ocean waters, its horizontal and vertical distribution, and the interrelationship between salinity, temperature, and water density.

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Revision Notes & Summary

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Chapter Notes

Hydrological Cycle

  • Definition: The hydrological cycle describes the continuous movement and exchange of water within the earth's hydrosphere.
  • Processes Involved:
    • Evaporation: Water is converted from liquid to vapor and rises into the atmosphere.
    • Condensation: Water vapor cools and changes back into liquid droplets.
    • Precipitation: Water falls from the atmosphere to the earth's surface as rain, snow, etc.
    • Runoff: Water flows over the land surface and returns to bodies of water.
  • Components:
    • Water storage in oceans, atmosphere, ice, snow, and groundwater.
    • Processes like evapotranspiration, sublimation, and infiltration.

Oceanic Relief Features

  • Major Divisions:
    • Continental Shelf: Extended margins of continents, shallow with an average width of 80 km.
    • Continental Slope: Steep slope connecting the shelf to the ocean basin, depth varies between 200 and 3,000 m.
    • Deep Sea Plain: Flat and smooth regions, depths between 3,000 and 6,000 m.
    • Oceanic Deeps/Trenches: Deepest parts, associated with tectonic activity.
  • Minor Features:
    • Mid-Oceanic Ridges: Mountain ranges under the ocean.
    • Seamounts: Volcanic mountains rising from the seafloor.
    • Submarine Canyons: Deep valleys cutting across continental shelves.
    • Guyots: Flat-topped seamounts.
    • Atolls: Coral reefs surrounding a lagoon.

Temperature Distribution in Oceans

  • Factors Affecting Temperature:
    • Latitude: Temperature decreases from the equator to poles.
    • Land-Water Distribution: Oceans in the northern hemisphere are warmer.
    • Winds: Influence temperature by moving warm or cold water.
    • Ocean Currents: Warm currents raise temperatures; cold currents lower them.
  • Vertical Distribution:
    • Thermocline: A layer with a rapid temperature decrease, found between 100-400 m depth.
    • Three-Layer System: Surface warm layer, thermocline, and deep cold layer.

Salinity of Ocean Waters

  • Definition: Salinity is the total content of dissolved salts in seawater, expressed in parts per thousand (ppt).
  • Factors Affecting Salinity:
    • Evaporation and Precipitation: Influence surface salinity.
    • River Influx and Ice Processes: Affect coastal and polar salinity.
    • Winds and Currents: Distribute salinity across regions.
  • Distribution:
    • Horizontal: Varies from 33 to 37 ppt in open oceans, higher in enclosed seas.
    • Vertical: Salinity increases with depth, forming a halocline where changes are sharp.
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Practice Test – MCQs, True/False

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Multiple Choice Questions

A.

It increases the salinity of the ocean.

B.

It transfers water from the ocean to the atmosphere.

C.

It causes water to flow underground.

D.

It leads to the formation of glaciers.
Correct Answer: B

Solution:

Evaporation is the process where water is converted from liquid to vapor and transferred from the ocean to the atmosphere.

Chapter Concept:

Hydrological Cycle

A.

Wind patterns

B.

Ocean currents

C.

Evaporation and precipitation

D.

Tectonic activity
Correct Answer: C

Solution:

The horizontal distribution of salinity in ocean waters is primarily influenced by evaporation and precipitation. High evaporation rates increase salinity, while high precipitation rates decrease it.

Chapter Concept:

Salinity of Ocean Waters

A.

Increasing salinity decreases density

B.

Increasing salinity has no effect on density

C.

Increasing salinity increases density

D.

Salinity and density are unrelated
Correct Answer: C

Solution:

Increasing salinity of seawater causes its density to increase.

Chapter Concept:

Salinity of Ocean Waters

A.

Continental Shelf

B.

Mid-Ocean Ridge

C.

Oceanic Deeps

D.

Abyssal Plain
Correct Answer: C

Solution:

Oceanic deeps or trenches are associated with strong earthquakes and active volcanoes due to their location at tectonic plate boundaries.

Chapter Concept:

Oceanic Relief Features

A.

Latitude

B.

Ocean currents

C.

Prevailing winds

D.

Land-water distribution
Correct Answer: A

Solution:

Latitude affects the temperature distribution of ocean surface water by decreasing the amount of insolation received as one moves from the equator towards the poles.

Chapter Concept:

Temperature Distribution in Oceans

A.

Volcanic activity

B.

Tectonic plate movements

C.

Sediment deposition

D.

Erosion by ocean currents
Correct Answer: B

Solution:

Oceanic trenches are primarily formed by tectonic plate movements, particularly at convergent boundaries.

Chapter Concept:

Oceanic Relief Features

A.

Condensation

B.

Runoff

C.

Evaporation

D.

Sublimation
Correct Answer: B

Solution:

Runoff is the process that moves water from land to the ocean.

Chapter Concept:

Hydrological Cycle

A.

Evaporation

B.

Freshwater flow from rivers

C.

Wind patterns

D.

Ocean currents
Correct Answer: B

Solution:

In coastal regions, the salinity of ocean water is greatly influenced by the freshwater flow from rivers.

Chapter Concept:

Salinity of Ocean Waters

A.

Continental Shelf

B.

Seamount

C.

Oceanic Deeps or Trenches

D.

Abyssal Plain
Correct Answer: C

Solution:

Oceanic Deeps or Trenches are associated with active volcanoes and strong earthquakes.

Chapter Concept:

Oceanic Relief Features

A.

Salinity levels would decrease due to increased ice melt.

B.

Salinity levels would increase due to higher evaporation rates.

C.

Salinity levels would remain constant.

D.

Salinity levels would fluctuate randomly.
Correct Answer: A

Solution:

Increased temperatures would cause ice to melt, contributing more freshwater to the ocean and decreasing salinity.

Chapter Concept:

Salinity of Ocean Waters

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Water (Oceans)

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True or False

Correct Answer: True

Solution:

The salinity of water in the surface layer of oceans depends mainly on evaporation and precipitation.

Chapter Concept :

Salinity of Ocean Waters

Correct Answer: True

Solution:

The thermocline is characterized by a rapid decrease in temperature, typically found between 100 and 400 m below the sea surface.

Chapter Concept :

Temperature Distribution in Oceans

Correct Answer: False

Solution:

About 71% of the earth's water is found in the oceans, not in glaciers and icecaps.

Chapter Concept :

Hydrological Cycle

Correct Answer: True

Solution:

Evaporation increases salinity by removing water, while precipitation decreases it by adding freshwater.

Chapter Concept :

Salinity of Ocean Waters

Correct Answer: False

Solution:

The highest ocean temperatures are recorded slightly north of the equator, not directly at it.

Chapter Concept :

Temperature Distribution in Oceans

Correct Answer: False

Solution:

The hydrological cycle involves the continuous exchange of water between the oceans, atmosphere, land surface, subsurface, and organisms.

Chapter Concept :

Hydrological Cycle

Correct Answer: False

Solution:

While the Arabian Sea shows higher salinity due to high evaporation, the Bay of Bengal has lower salinity due to river water influx.

Chapter Concept :

Salinity of Ocean Waters

Correct Answer: True

Solution:

The average width of continental shelves is indeed about 80 km, though it varies significantly in different regions.

Chapter Concept :

Oceanic Relief Features

Correct Answer: False

Solution:

The temperature of ocean waters is higher in the northern hemisphere due to a larger extent of land, which causes more heat absorption.

Chapter Concept :

Temperature Distribution in Oceans

Correct Answer: True

Solution:

The cold surface temperatures in these regions create a uniform cold water layer extending to the ocean floor.

Chapter Concept :

Salinity of Ocean Waters

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