What does an unconformity in a sequence of rock layers reveal about geologic history?

Answer(a); // soil salinization and waterlogging;

Answer decreased soil salinity;

Joe ran 130 yards because 3 feet make 1 yard so using this ratio 390 feet make 130 yards.

Historians are researchers of the past or people who understand the history of people. with this field, they must possess qualities such as being unbiased, patient, efficient reader, has a knack for logic and critical thinking and reasoning, disciplined, open-minded, resourceful, with good analytical ability, good reasoning skills and problem solving!