Rills, gullies, streams, rivers and tributaries are all caused by
a.
land erosion
c.
soil erosion
b.
water erosion
d.
river erosion

The answer is b. water erosion

Water erosion moves water downhill and during this process, different landforms are formed. Some of them are rills, gullies, streams, rivers, tributaries, waterfalls, floodplains, meander, lakes, etc.

You not be doing this in a quiz. if you actually studied your work you would know the answer. the answer though is that they would use gdp per capita because it measures a smaller portion (person). this could show individual growth per person in the country.

Lol why dont you actually do the work instead of have people do it for you. jk i do it too lol