Final answer:
The cessation of convection in the Earth's liquid outer core would impact the surface by weakening the magnetic field and reducing tectonic plate movement.
Step-by-step explanation:
If convection ceased happening in Earth's liquid outer core, the surface of the Earth would be impacted in several ways.
Firstly, convection in the liquid regions of the Earth's outer core plays a crucial role in the creation of the Earth's magnetic field. This magnetic field shields the Earth from harmful solar radiation and helps protect the atmosphere. Without convection, the magnetic field would weaken over time, leaving the Earth more vulnerable to solar radiation.
Secondly, convection in the outer core is responsible for the movement of tectonic plates on the Earth's surface. This movement leads to earthquakes, volcanic eruptions, and the creation of new landforms. Without convection, tectonic plate movement would slow down, resulting in fewer geological activities.
Overall, the cessation of convection in the Earth's liquid outer core would have significant impacts on the Earth's surface, affecting both the protection from solar radiation and the geological processes that shape the planet.