On a yearly bases, agents of erosion are more active on

Earths crust.

Explanation:

There are four common agents of erosion as the wind, water, ice, and gravity, etc, that break up the sediments and rocks and the soil and from the land surfaces and they are responsible for the climatic factor linked with the water erosion by rivers and streams and the coastal lands.

Geologists use  seismic waves to  locate an earthquake's epicenter.. 

The answer to the question is gold