1. Divergent Plate Boundaries:
* Description: Plates move apart from each other.
* Features:
* Mid-ocean ridges: Underwater mountain ranges where new oceanic crust is formed.
* Rift valleys: Landmasses split and form valleys (e.g., Great Rift Valley in Africa).
* Volcanic activity: Magma rises from the mantle to fill the gap between plates.
* Examples: Mid-Atlantic Ridge, East African Rift Valley.
2. Convergent Plate Boundaries:
* Description: Plates move towards each other.
* Features:
* Subduction zones: One plate slides beneath the other (denser plate subducts).
* Volcanoes: Subducting plate melts, creating magma that rises to the surface.
* Deep-sea trenches: Depressions in the ocean floor created by subduction.
* Mountain ranges: Collision of two continental plates can create mountain ranges (e.g., Himalayas).
* Types:
* Oceanic-continental convergence: Oceanic plate subducts under continental plate (e.g., Andes Mountains).
* Oceanic-oceanic convergence: One oceanic plate subducts under another (e.g., Mariana Trench).
* Continental-continental convergence: Two continental plates collide (e.g., Himalayas).
3. Transform Plate Boundaries:
* Description: Plates slide horizontally past each other.
* Features:
* Faults: Fractures in the Earth's crust where movement occurs.
* Earthquakes: Earthquakes occur along transform boundaries as the plates grind past each other.
* Examples: San Andreas Fault (California), North Anatolian Fault (Turkey).
It's important to note:
* Plate boundaries are complex and can exhibit characteristics of multiple types.
* Plate movement is not uniform; it can vary in speed and direction.
* The interactions between plates shape the Earth's surface and drive many geological processes.
