Gap Fill - Earth's Axis - Level 4

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   alone      factor      glaciers      gravity      irrigation      mass      planet      previously      shifts      surface   

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."

Try the Earth's Axis - Level 5 gap fill.

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