Final answer:
True. Earth's topography is more varied than that of any known planet due to plate tectonics, volcanic activity, erosion, and movements of the continents. The presence of cratered highland terrain and younger volcanic plains further supports this.
Step-by-step explanation:
True. Earth's topography is indeed more varied than that of any known planet. This is due to various geological processes such as plate tectonics, volcanic activity, erosion, and large-scale movements of the continents. Unlike other terrestrial planets like Venus, Earth's surface is constantly reworked and most of its surface material is relatively young, less than 200 million years old. The presence of heavily cratered highland terrain in the southern hemisphere and younger volcanic plains in the northern hemisphere further reinforces the varied topography of Earth.