Final answer:
The subject of this question is Geology, specifically the Law of Original Horizontality and the deformation of rock layers caused by outside forces like tectonic plate movements.
Step-by-step explanation:
The subject of the question is Geology. Geology is the scientific study of the Earth's solid materials, structures, processes, and history.
The law mentioned in the question is called the Law of Original Horizontality. This law states that sedimentary rock layers are originally deposited horizontally.
If rock layers are now folded and tilted, it is because of later outside forces, such as tectonic plate movements. These forces can cause the rock layers to be deformed and folded over time.
Learn more about Geology