What happens to ocean rocks or crust as lava exits the mid-ocean ridge?

Magma erupts on Earth's surface as lava, which cools and crystallizes on the seafloor, forming rock. Because the lava erupts into water, it cools rapidly and forms rounded structures called pillow lavas. As the seafloor continues to spread apart, the older oceanic crust moves away from the mid-ocean ridge.

Explanation:

Hope this helps, have a great day! :D

i'm sure the answer you are looking for would be

a. an ice age

hope this contact me if this didn't or you need with more answers : )