Final answer:
If plate tectonics stopped, earthquakes would end, landform development would stagnate, geological inactivity would ensue, and potentially, over long timescales, global climate could change significantly.
Step-by-step explanation:
If plate tectonics stopped, it would lead to profound changes in Earth's geology. There would indeed be an end of earthquakes because they are primarily caused by the movement or shifting of tectonic plates. Similarly, the stagnation of landforms would occur as the creation and transformation of mountains, valleys, and other topographic features are a result of tectonic activity. A halt in plate movements would also result in geological inactivity; new land features would stop forming, and existing ones would erode without new material being brought up from the Earth's mantle.
Concerning global climate change, while plate tectonics contribute to long-term climate patterns through mechanisms like the carbon cycle and the location of continents, an immediate stop in plate movements might not directly change the global climate. However, over geological timescales, the impact on climate could be significant due to changes in ocean circulation and the distribution of land and sea.
Overall, the halt of plate tectonics would dramatically reshape the long-term evolution of the Earth's surface and could affect its ability to support a diverse range of life forms.