Which of the following is a correct principle of relative-age dating?

a. in undisturbed rock layers, the youngest rocks are on the bottom.
b. rock-forming materials are deposited in horizontal layers, though they may be tilted later.
c. sediments are deposited in lateral sheets, but their orders often change.
d. if one rock contains pieces of another, the rock containing the pieces is older than the pieces.

The correct answer is B) Rock-forming materials are deposited in horizontal layers, though they may be tilted later.  

The option that is a correct principle of relative-age dating is "Rock-forming materials are deposited in horizontal layers, though they may be tilted later."

When using relative dating, scientists consider six principles to determine the relative age of the formation. These are the Principle of Superposition, the Principle of Original Horizontality, the Principle of Lateral Continuity, the Principle of Cross Continuity, the Principle of Inclusions, and the Principle of Fossil Succession.

sleep paralysis is a parasomnia, events associated with sleep.

sleep paralysis happens when you are in the middle of waking up or falling asleep. it is the feeling of being conscious but unable to move. it definitely involves hallucinations.

i had a friend that had sleep paralysis and he told me a story one time where he was laying in bed and he couldn't move his body no matter how hard he tried and there was someone standing in the corner of his room coming towards him. he couldn't move and you can't "wake up" because you are already conscious. sometimes sleep paralysis can be triggered by frequent waking up during the night based off of multiple trips to the bathroom, or if you had ever been abused, sleep paralysis can start happening from things like that.