Sinkhole rain. An analysis of a case of sinkhole formation under a retention pond due to a large amount of rain can be seen in a sinkhole collapse study. Sinkholes have been used for centuries as disposal sites for various forms of waste. A consequence of this is the pollution of groundwater resources, with serious health implications in such areas. The Maya civilization sometimes used sinkholes in the Yucatán Peninsula (known as cenotes) as places to deposit precious items and human sacrifices. When sinkholes are very deep or connected to caves, they may offer challenges for experienced cavers or, when water-filled,
The Heart Is a Lonely Hunter (Once Upon a Time) that Graham helped fill a void for her character, commenting that his loss "was not easy for [Regina]. That’s why, when she crushes his heart, there’s a tear coming out of her eye. She didn’t want to do it, but she had no choice — almost like how she had no choice to kill her father. I’m not saying I agree with it, but for the character, it’s what she had to do." Parrilla also cited "The Heart Is a Lonely Hunter" as the first episode where viewers see "how the two worlds collided," a reference to Regina's ability to