Final answer:
A reverse fault that has a gentle dip is known as a thrust fault, typically inclined at less than 30 degrees and formed due to compressional stresses in the Earth's crust.
Step-by-step explanation:
If a reverse fault has a gentle dip or curves at depth to attain a gentle dip, then it's a thrust fault. A thrust fault is a special type of reverse fault with a gentle dip that is generally less than 30°.
In the context of thrust faults, the block that is moved upwards along the fault is known as the allochthonous block, which is thrust over the stationary autochthonous block. These types of faults are formed due to compressional stresses that cause shortening of the Earth's crust and are common in mountain belts formed by tectonic collisions.
In addition, features such as klippes and windows can form due to erosion of allochthonous blocks, giving us further insight into the geological history of the region.