Gap Fill - Earth's Axis - Level 5


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   balance      effect      enough      feet      humans      levels      polar      pumping      reservoirs      tons   

Paragraph 1

Scientists know the of underground on maintaining Earth's . Geophysicist Ki-Weon Seo has discovered that have extracted so much groundwater from under our that the tilt of Earth's axis has changed. This shift has been big to relocate the North Pole. The mass of ice is drifting by more than four centimetres a year. Professor Seo calculated that we extracted more than two trillion of groundwater between 1993 and 2010. This caused Earth to wobble. Seo said the of groundwater has caused sea to rise by 6.24 millimetres.

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