Question

which statement accurately describes one aspect of plate tectonics that involves subduction and seafloor spreading?
○ older crust is melted at subduction zones.
○ crust is created at the coastlines of continents.
○ continents do not move as a result of seafloor spreading and subduction.
○ crust is created as the mantle hardens under the lithosphere.

Explanation:

• Seafloor spreading creates new oceanic crust at mid-ocean ridges, while subduction zones occur where denser, older oceanic crust is pushed under another tectonic plate and melts back into the mantle.
• Crust is created at mid-ocean ridges, not continental coastlines.
• Seafloor spreading and subduction are key drivers of continental drift, so continents do move due to these processes.
• New crust forms from magma rising at mid-ocean ridges, not mantle hardening under the lithosphere.

Answer:

Older crust is melted at subduction zones.