### Question
How is the "geophysical surveys" defined?


### Answer
The term **geophysical surveys** is defined in *30 U.S.C. § 28* as follows -

> surveys on the ground for mineral deposits through the employment of generally recognized equipment and methods for measuring physical differences between rock types or discontinuities in geological formations

#### Citation:
  - *30 U.S.C. § 28*
  - Heading: **CHAPTER 2-MINERAL LANDS AND REGULATIONS IN GENERAL**

