The primary difference between continental and oceanic tectonic plates lies in their composition, density, and thickness. Continental plates are less dense and generally thicker than oceanic plates.
Composition and Density
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Continental Plates: These plates are primarily composed of granite, a relatively light-colored and less dense rock. This lower density allows continental crust to "float" higher on the Earth's mantle. The reference also indicates that they are made from recycled materials.
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Oceanic Plates: Oceanic plates are mostly made of basalt, a dark-colored, denser volcanic rock. The higher density of basalt causes oceanic crust to sit lower in the mantle than continental crust.
Thickness
- While the provided reference doesn't give specific thickness values, it implies that continental plates are generally thicker than oceanic plates. The exact thickness varies depending on location and geological activity.
Surface Area
- Oceanic plates cover approximately 71% of the Earth's surface.
- Continental plates make up about 29% of the Earth's surface.
Summary Table
| Feature | Continental Plates | Oceanic Plates |
|---|---|---|
| Composition | Granite | Basalt |
| Density | Lower | Higher |
| Thickness | Generally Thicker | Generally Thinner |
| Surface Coverage | 29% | 71% |
In summary, continental plates are composed of less dense granite and are generally thicker, while oceanic plates are composed of denser basalt and are generally thinner. This difference in density and composition influences their elevation on the Earth's surface and their role in plate tectonics.
