Gap Fill - Magnetic Poles - Level 5


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   ago      beach      climate      communications      danger      deadly      direction      enough      every      existence      forms      gigantic      molten      radiation      rays      rays      responsible      scientists      threat      war  
When warn us about threats to our , we usually hear about climate change, asteroids or nuclear . Now scientists have warned of the of Earth's magnetic poles flipping upside down. The poles are for the magnetic shield around Earth. This protects us from radiation. Life on Earth depends on this shield. Radiation and solar cause a lot of damage. The poles could flip in the next thousand years. This is because the iron revolving around Earth's center is changing . The molten iron acts as a electromagnet.

Earth's magnetic poles have flipped 250,000 years. The last time was 780,000 years . The next flip is long overdue. The flip could destroy and power grids; deadly solar could greatly increase rates of cancer; and change could kill many life . Some scientists say a polar flip could blow Earth's atmosphere away. One scientist dismissed any from the poles flipping. He believes any increased would be as harmful as lying on a for a day. He said a "floppy hat" would be to protect us.

Try the Magnetic Poles - Level 6 gap fill.

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