A plate boundary is the place where two tectonic plates meet. Since Earth’s crust is broken into large plates that slowly move, these boundaries are very important because they are often where earthquakes, volcanoes, and mountains form.There are three main types of plate boundaries:Divergent boundary – plates move away from each other.Example: The Mid-Atlantic Ridge, where new seafloor is formed.Convergent boundary – plates move toward each other.Example: The Himalayan Mountains, formed when the Indian Plate collided with the Eurasian Plate.Transform boundary – plates slide past each other.Example: The San Andreas Fault in California, where earthquakes often happen.