The seafloor feature found along the rifts in mid-ocean ridges is hydrothermal vents.

Here's why:

* Mid-ocean ridges are underwater mountain ranges where new oceanic crust is formed.

* Rifts are the central valleys within these ridges where magma rises from the Earth's mantle.

* Hydrothermal vents are openings in the seafloor where heated water, rich in dissolved minerals, is released. They form along rifts because the rising magma heats the surrounding seawater, which then reacts with the rocks and dissolves minerals.

These vents support unique ecosystems and are crucial for understanding the chemistry and geology of the Earth's crust.