Final answer:
The Red Sea and the East Africa Rift Zone are examples of a rift boundary where the African continent is splitting into smaller tectonic plates.
Step-by-step explanation:
The Red Sea and the East Africa Rift Zone are examples of a rift boundary. A rift boundary occurs when tectonic plates pull apart from each other, creating a gap where molten rock can rise from below to fill the space, forming new crust.
This process is observed in the East Africa Rift Zone, where the African continent is slowly splitting into the Somalian Plate and the Nubian Plate, leading to the formation of the Western Rift, with its series of deep water lakes and mountain ranges, and the Eastern Rift, home to inactive volcanic peaks like Mount Kilimanjaro and Mount Kenya. Similarly, the Red Sea is a result of such rifting, which continues to widen as the African Plate splits apart. These geologic formations exemplify the dynamic nature of Earth's crust as part of the cycle of plate tectonics.