Which branch of geography focuses upon natural landforms, climate, soils, and vegetation of the earth?

The correct answer is - physical geography.

The focus of the physical geography is on the physical features on our planet, be it bodies of water, landforms, or natural resources. The physical geography is interested in the shape of the natural physical features, as well as their structure, how did they become like that, the evolution trends, what was the cause for them to form, and how will it all look like in the future. It is a very wide geographic area of study, and it has lots of sub-disciplines as part of it, in order for every specific aspect of the nature to be properly examined and explained.

The correct answers are:

- decreased forest land;

In order for the urbanization to take place, the natural areas, usually forests and grasslands, need to be cleared. With the clearing out of them, the forests and grasslands are decreasing as they have been ruined and occupied with infrastructure.

- increased paved surfaces;

The urbanization predicts the building of lot of infrastructure, big portion of which is with concrete and asphalt, thus significantly increasing the paved surfaces.

- increased soil erosion;

Because of the aforementioned clearing of the forests and grasslands, the soil loses its natural protection from erosion, so the soil that is left like that on the open will be very vulnerable to the erosion.