Stratigraphic correlation is dating through the use of a chronometric method. O matching stratigraphy from known sites only. O matching strata by chemical composition and color from several sites across distances. O correlating stratigraphic markers in one location.

matching strata by chemical composition and color from several sites across distances

Explanation:

The Stratigraphic correlation involves the correlation of the various layers of the strata of the rocks and the in comparison to several sites in terms of their chemical, physical and biological properties.Through this relationship with the various layers of the earth can be created that have regards to the changes takes place in the history of the earth.

Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.

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!