Paragraph 2
Groundwater affects Earth's
. Seo said: "Every
moving around on the
of the Earth can change the rotation axis." Scientists
thought water-driven
were caused by melting
. Seo was puzzled at how this
could cause a tilt. He concluded that underground water was also a
. Most groundwater we use is for
. Another researcher said: "The very way the
wobbles is impacted by our activities."