Which pair of terms applies to changes such as drought and earthquakes? 

A)  natural and catastrophic 
B)  human caused and catastrophic 
C)  natural and gradual 
D)  human caused and gradual

Catastrophic

Involving or causing sudden great damage or suffering, typically on a large scale or involving a natural disaster.

Drought

Drought is a prolonged period of abnormally low rainfall, leading to a shortage of water that adversely affects crops, animals, and human populations.

Earthquakes

Natural seismic events resulting from the sudden release of energy in the Earth's crust, leading to ground shaking and sometimes causing significant damage and loss of life.