Question

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.

Answer 1

Large rift zones allow blocks of crust to be displaced downward, forming a rift, and basaltic lava erupts within the rift forming lava flows on the seafloor. Other magma solidifies within fissures, forming intrusive igneous rocks. As two oceanic plates move apart, rock and magma in the mantle rise to occupy this space.

Step-by-step explanation:

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

Answer 2

Normal faults,

Step-by-step 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.