Answer the following question given this paragraph: The study of rock strata is called stratigraphy . The laws of stratigraphy can help scientists understand Earth's past. The laws of stratigraphy are usually credited to a geologist from Denmark named Nicolas Steno. He lived in the 1600s. The laws are illustrated in the Figure below ; refer to the figure as you read about Steno's laws below. Q: What is the study of rock strata called? A:

Select from the following.
+biochemistry;
+chemistry;
+biology;
+stratigraphy;
The answer is:
stratigraphy