Geography - Our world

1. Physical Geography

Physical geography explores the natural environment, processes, and patterns that shape the surface of Earth.

• Landforms and Earth Dynamics

  • Tectonic activity drives plate movements, forming mountain ranges, rift valleys, and volcanic structures.

  • Surface processes like weathering, erosion, and deposition continuously reshape features through water, wind, ice, and gravity.

• Climate and Weather Systems

  • Earth is divided into major climate zones: tropical, dry, temperate, continental, and polar.

  • Global atmospheric and oceanic circulation patterns distribute heat from the equator toward the poles.

2. Earth System Spheres

The planet functions through four interconnected environmental spheres:

1. Lithosphere

   • The solid, outer portion of Earth encompassing the crust and uppermost mantle.

2. Hydrosphere

   • All liquid, frozen, and gaseous water on Earth, covering approximately $71\%$ of the surface.

3. Atmosphere

   • The layer of gases surrounding Earth, primarily composed of nitrogen ($78\%$) and oxygen ($21\%$).

4. Biosphere

   • The global ecological system integrating all living beings and their relationships.

3. Human and Regional Geography

Human geography studies how human activities shape and are shaped by Earth's surface.

• Population and Demographics

  • Human settlement is unevenly distributed, concentrated near water sources, arable land, and temperate climates.

  • Migration patterns are influenced by push factors (e.g., conflict, economic hardship) and pull factors (e.g., job opportunities, political stability).

• Continents and Major Oceans

  • Earth features seven major continents: Asia, Africa, North America, South America, Antarctica, Europe, and Australia.

  • Five principal ocean basins cover the majority of the planet: Pacific, Atlantic, Indian, Southern, and Arctic.