Which type of unconformity exists between two horizontal rock layers if the older rock is much older than the younger rock?

May someone me with these science questions

Air can be considered a mixture. which statement does not explain why?

Which of these is an example of pseudoscience? a) predicting the time of sunrise based on data on position of earth b) predicting the date of the moon phases based on data on position of earth c) predicting eclipses based on the position of the sun and the moon d) predicting future events in a person's life based on the position of the moon