Natural causes of the dust bowl included all of the following except
a: erosion
b: light soil
c: floods
d: drought

The correct answer is flood

Hope this helped!

Option (C)

Explanation:

The dust bowl is usually defined as an area where the soil remains dry for a prolonged period of time, due to the significant erosion and drought and also due to lack of rainfall. Due to this, the vegetation cannot be done.  

It is not related to flood because flood is a natural disaster that occurs when the water from the river flows towards the nearby land areas due to the breaking down of natural levees and dams. This water when enters into the inland areas causes a lot of damages to both lives and properties.

Thus, dust bowls are not caused by floods.

Hence, the correct answer is option (C).

ok so u have2 basically

declare war, appoint military officers, sign treaties, make alliances