compasses, rock hammers, hand lenses, and field books.
Explanation:
they use rock hammers to obtain a fresh surface of a rock to determine its composition, nature, mineralogy, history, and field estimate of rock strength. compasses for, both orienteering and for taking structural measurements like strike and dip of sedimentary beds or trend and plunge of fold axes. hand lenses to take a closer look at rocks. and they use field books to record the detailed observations of geologists working in the outdoors.
