Difference between "Geology" and "Physical(Natural) Geography"?
Physical Geography is a wide area of study - there is many sub-disciplines in this field, such as Biogeography, Climatology, Hydrology, Pedology, Geomorphology (and others as well). Often the scale interesting for the physical geographer is the recent past and future, calculated in thousand of years before today up to a few million (time scale could vary in the recent past (last few years and up to the glaciations and Pleistocene at large). Further, it is focused on surface processes, and not necessarily on rocks, there is a lot more interest in dirt, soils, looses pebbles, and their dynamics of erosion and deposition, the processes affecting the surface. A physical geographer will enjoy hunting for deposits exposure when in the field, so a wall of ancient dirt stratae.

On the other hand, the Geology field is interested in longer period of time, in rocks, often very deep rocks, the internal geodynamics (mantle, core, magma), will consider the disposition of crystals, petrology, geochemistry of rocks. Otherwise, geologist will be interested in the same topics that physical geographer do, but will use different tools, or consider those topics as a factor among many. Geologist may be mingling with the engineering world better than geographers. They will hunt for outcrops in the field, like intact, in situ rocks that can explain something about the site.

To illustrate this, when I go in the field with geologists, I prefer to bring a shovel, they bring a hammer (I bring one too but will choose the shovel over!). We will enjoy the accessibility to a drill to make boreholes, but will be happy with the first 5 meters depth where they would be interested more in deeper drilling. Further, I will be glad to drill in soils and dirt, where they would definitely prefer in rocks.