Study Notes on Earth's Layers and Crust Characteristics

Layers of the Earth

  • Crust: Outermost solid rock layer, classified into oceanic and continental.
  • Mantle: Thickest layer of Earth, comprising most of its volume.
  • Outer Core: Liquid layer, molten due to high temperatures.
  • Inner Core: Solid center of Earth, under immense pressure.

Learning Outcomes

  • Estimate Earth's surface coverage by land vs. water.
  • Differentiate between oceanic and continental crusts.
  • Classify landforms based on crust type.

Key Vocabulary

  • Density: Mass-to-volume ratio.
  • Hemisphere: Half of a celestial sphere divided by an imaginary line.
  • Oceanic: Relating to oceans.
  • Continental: Relating to continents.

Crust Characteristics

  • Continental Crust:

    • Composed mainly of granitic rocks.
    • Thicker and less dense than oceanic crust.
    • Includes plains, mountain ranges, and landmasses.

  • Oceanic Crust:

    • Composed of basaltic rocks.
    • Thinner and denser than continental crust.
    • Characterized by underwater volcanic activity, deep-sea trenches, and mid-ocean ridges.

Questions for Analysis

  1. Investigate land and water distribution observations.
  2. Discuss why the Northern Hemisphere is the land hemisphere and the Southern Hemisphere the water hemisphere.
  3. Examine the implications of density differences between crust types during collision events.