What type of boundary separates tectonic plates that are moving away from each other?

A boundary that separates tectonic plates moving away from each other is classified as a divergent boundary. This type of boundary is characterized by the creation of new oceanic crust as magma rises from the mantle to fill the gap formed by the diverging plates. As the plates separate, they can lead to the formation of mid-ocean ridges, rift valleys, and volcanic activity, all of which are significant geological features associated with divergent boundaries.

The movement of tectonic plates at divergent boundaries typically occurs in oceanic regions, although it can also be found on land in the form of rift valleys. This process contributes to the recycling of the Earth's crust and plays a crucial role in plate tectonics and the dynamic nature of the planet’s surface.