Geologists obtain indirect evidence about earth’s interior by
a. measuring pressure differences at earth’s surface.
b. estimating temperature inside earth.
c. directly looking under the many layers.
d. recording and studying seismic waves.

i believe the answer is c

common management practices in dairy and poultry farming are: (i) proper shelter facilities and their regular cleaning. (ii) some basic hygienic conditions such as clean water, nutritious food, etc. (iii) animals are kept in spacious, airy, and ventilated place.