Geography 101: Introduction to Geography - Geographic Coordinate System Latitude Longitude Equator Prime Meridian Hemispheres

What This Is

The Geographic Coordinate System is a framework used to locate and identify points on the Earth's surface. It consists of latitude, longitude, the Equator, and the Prime Meridian, which together divide the Earth into hemispheres. Understanding this system is crucial for geography as it enables us to pinpoint locations, study global patterns, and analyze the impact of natural phenomena on different regions. For instance, the eruption of Mount Pinatubo in the Philippines in 1991 was a significant event that affected global climate patterns, and knowing its exact location is essential for understanding its effects.

Key Processes, Landforms & Theories

• Latitude: Measured in degrees north or south of the Equator, latitude determines the climate and vegetation of a region. The Amazon rainforest, near the Equator, is a classic example of a region with high temperatures and high levels of rainfall.
• Longitude: Measured in degrees east or west of the Prime Meridian, longitude helps us locate points on the Earth's surface. The city of Greenwich, London, is home to the Prime Meridian, which passes through the Royal Observatory.
• Equator: An imaginary line that divides the Earth into the Northern and Southern Hemispheres, the Equator receives direct sunlight throughout the year, resulting in a relatively constant temperature. The Equatorial region of Africa is home to the Congo Basin, one of the world's most biodiverse ecosystems.
• Prime Meridian: An imaginary line that passes through Greenwich, London, the Prime Meridian serves as the reference point for measuring longitude. The Prime Meridian is also known as the Greenwich Meridian.
• Hemispheres: The Earth is divided into four hemispheres: Northern, Southern, Eastern, and Western. The Northern Hemisphere includes most of North America, Europe, and Asia, while the Southern Hemisphere includes most of South America, Africa, and Australia.
• Meridians: Imaginary lines that run from the North Pole to the South Pole, meridians are used to measure longitude. The 180th meridian, which passes through the middle of the Pacific Ocean, is an example of a meridian.
• Parallels: Imaginary lines that run east-west, parallels are used to measure latitude. The 30th parallel north, which passes through the southern United States and Mexico, is an example of a parallel.
• Tropics of Cancer and Capricorn: The Tropics of Cancer and Capricorn are imaginary lines that mark the boundaries of the tropics. The Tropic of Cancer is located at 23.5°N latitude, while the Tropic of Capricorn is located at 23.5°S latitude.
• Arctic and Antarctic Circles: The Arctic and Antarctic Circles are imaginary lines that mark the boundaries of the polar regions. The Arctic Circle is located at 66.5°N latitude, while the Antarctic Circle is located at 66.5°S latitude.

Step-by-Step Application

1. Identify the location of a point on the Earth's surface: Use latitude and longitude to pinpoint a location on a map or globe.
2. Understand the climate and vegetation of a region: Use latitude to determine the climate and vegetation of a region.
3. Locate a region on a map: Use longitude to locate a region on a map.
4. Analyze the impact of natural phenomena: Use the Geographic Coordinate System to analyze the impact of natural phenomena, such as hurricanes or earthquakes, on different regions.
5. Identify hemispheres and meridians: Use the Geographic Coordinate System to identify hemispheres and meridians on a map or globe.
6. Calculate distances between locations: Use the Geographic Coordinate System to calculate distances between locations.

Common Misconceptions

• Misconception: Deserts are always hot.
• Correction: Deserts can be hot or cold, depending on their location. The Gobi Desert in Asia is a cold desert, while the Sahara Desert in Africa is a hot desert.
• Misconception: Water in a river flows faster on the inside of a meander.
• Correction: Water in a river flows faster on the outside of a meander, due to the increased velocity of the water as it flows around the bend.
• Misconception: Plate tectonics causes volcanoes everywhere.
• Correction: Plate tectonics causes volcanoes in areas where there is subduction or rifting, such as the Pacific Ring of Fire.

Exam / Short-Answer Tips

• Explain the Geographic Coordinate System: Use the Geographic Coordinate System to explain how to locate points on the Earth's surface.
• Draw and annotate a labelled diagram: Draw a labelled diagram of the Geographic Coordinate System and annotate it with key features.
• Tricky distinctions: Be able to distinguish between hemispheres, meridians, and parallels.
• Place-specific detail: Include place-specific detail in your answers, such as the location of the Equator or the Prime Meridian.

Quick Practice Scenario

A river curves sharply, cutting into the outer bank while depositing sediment on the inner bank. Name the feature and explain the process.

Answer: Meander, a type of river bend that occurs when the river flows around a curve, cutting into the outer bank and depositing sediment on the inner bank.

Last-Minute Cram Sheet

• Latitude is measured in degrees north or south of the Equator.
• Longitude is measured in degrees east or west of the Prime Meridian.
• The Equator receives direct sunlight throughout the year.
• The Prime Meridian passes through Greenwich, London.
• Hemispheres are divided by the Equator and the Prime Meridian.
• Meridians are imaginary lines that run from the North Pole to the South Pole.
• Parallels are imaginary lines that run east-west.
• The Tropics of Cancer and Capricorn mark the boundaries of the tropics.
• The Arctic and Antarctic Circles mark the boundaries of the polar regions.
• Weathering is the breakdown of rock in situ – no movement; erosion involves removal and transport.