The theory that explains the causes of earthquakes and volcanoes is plate tectonics
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True. If you are in a trench, you are literally sitting in a hole in the dirt for hours on end; sometimes keeping watch, sometimes in the heat of battle. If you get injured, there are tons of diseases in the dirt and from humans just sitting in that hole for large amounts of time, usually without showering for days or weeks (depending on where you are and the resources available). Injury, you could get shot in the shoulder while firing, or someone could throw an active grenade into the trench and, well, it wouldn't end well. Mud-- you're sitting in a hole, in the dirt. If it rains, you are now sitting in a wet hole in the dirt, and dedication to your country--or flying bullets--is keeping you there.
A tropical cyclone is a rapidly rotating storm system characterized by a low-pressure center, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain and/or squalls
C. Largely uneconomic because they provide little profit or food surplus
I think the correct answer from the choices listed above is the third oprion. The mini-fundia is a small (sub-family) land holdings of peasants in Latin America. While mini-fundias support many subsistence families, they are largely uneconomic in that they provide few surpluses.
