system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How are hills made? For example, how are there hills in central Texas if there is no seismic activity?
gpt
There is a fault line that runs along I35 between Dallas and San Antonio. If you stop at Wonder World you can tour the fault line and they do a good job showing the different topography on each side of the fault. So the answer is that the hills were formed due to seismic activity that formed the hills and Balcones Fault long ago.