Large allow blocks of crust to be displaced downward, forming a rift. Basaltic lava erupts within the rift forming on the seafloor. Other magma solidifies within fissures, forming . As the crust cools, it subsides and is covered by , which tends to smooth over any rough topography. As two oceanic plates move apart, rock and magma in the rise to occupy this space.

Normal faults,

Explanation:

Large normal faults allow blocks of crust to be displaced downward, forming a rift.

Basaltic lava erupts within the rift forming pillow ba  salts on the seafloor. Other magma solidifies within fissures, forming di kes . As the crust cools, it subsides and is covered by , which tends to smooth over any rough topography. As two oceanic plates move apart, rock and magma in themantle rise to occupy this space.

a. themes: sub fields