ThinkRankDistribution of Oceans and Continents
Overview
From Wegener's early drift hypothesis to the modern theory of Plate Tectonics, this chapter traces how our understanding of the Earth’s moving surface has evolved through evidence like sea floor spreading and paleomagnetism.
Learning Objectives
- Evaluate the evidence for Continental Drift
- Describe the mechanism of Sea Floor Spreading
- Identify the major lithospheric plates and their boundary types
- Explain the driving force of mantle convection
Key Concepts
Plate Tectonics
The theory that Earth's outer shell is divided into several plates that glide over the mantle. This movement accounts for the creation of mountains, earthquakes, and ocean basins.
Convergent vs Divergent Boundaries
Convergent boundaries involve plates colliding (Himalayas), while divergent boundaries involve plates pulling apart (Mid-Atlantic Ridge).
Key Terms
PaleomagnetismSubductionMid-Oceanic RidgePangeaConvection
Examples
The Himalayas
Formed by the ongoing collision between the Indian and Eurasian plates, a classic example of continental-continental convergence.
Quick Check
- Who proposed the Continental Drift theory?
- What happens at a subduction zone?