What is the most direct cause of an earthquake? 

A)  the creation of a fault 
B)  the greenhouse effect 
C)  the dumping of toxic wastes 
D)  a change in ocean currents

Greenhouse Effect

The process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without its atmosphere.

Toxic Wastes

Hazardous waste materials that can cause death, injury, or health issues in living organisms upon exposure.

Ocean Currents

Large-scale movements of water within the oceans that play a critical role in regulating the Earth's climate by distributing heat around the planet.