Mid-ocean ridges are extensive underwater mountain ranges formed by plate tectonics. These volcanic systems are continuous and span tens of thousands of kilometers across the ocean floor, making them significantly longer than any individual fold mountain range found on the Earth's continents.

Transform plate movement occurs at transform boundaries where plates slide laterally past one another. Unlike convergent or divergent boundaries, crust is neither created nor destroyed at these locations. The friction between these plates often leads to significant seismic activity as energy is released.

At divergent plate boundaries, the lithosphere pulls apart, reducing pressure on the underlying mantle. This causes decompression melting, allowing magma to rise. Once this molten rock reaches the Earth's surface, it is referred to as lava.

A divergent plate boundary occurs where two tectonic plates move away from each other. The separation of the South American Plate and the African Plate is a primary example, which led to the formation of the Mid-Atlantic Ridge. As the plates pull apart, magma rises from the mantle to create new oceanic crust, continuously widening the Atlantic Ocean floor.

The Nazca Plate is an oceanic plate that is denser than the continental South American Plate. When they converge, the Nazca Plate is forced downward into the mantle beneath the South American Plate in a process known as subduction. This interaction is responsible for the formation of the Andes Mountains and frequent seismic activity in the region.

The word 'tectonics' originates from the Greek word 'tekton', which translates to 'builder' or 'carpenter'. In the context of geology, the term refers to the large-scale processes that shape the Earth's crust, effectively 'building' the structural features of the planet's surface. Plate tectonics describes the movement and interaction of the lithospheric plates, which are the primary agents responsible for the formation of mountains, ocean basins, and volcanic activity throughout geological history.

Crustal plates are generally categorized into two main types: oceanic plates and continental plates. These differ in density, composition, and thickness, which significantly influences their interactions at plate boundaries.

Divergent plate boundaries occur where tectonic plates move away from each other. In the case of the Atlantic Ocean, the Mid-Atlantic Ridge is a divergent boundary where new seafloor is created, causing the ocean basin to gradually expand over geological time.

Earthquakes and volcanic eruptions are primarily concentrated along plate boundaries. These are the zones where tectonic plates interact through convergence, divergence, or transform motion. The stress and heat generated at these margins are the primary drivers for the release of seismic energy and the ascent of magma to the surface.