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ESA Euronews: Measuring Earth's Vital Magnetic Field, ESA
http://spaceinvideos.esa.int/Videos/2012/10/ESA_Euronews_Measuring_earth_s_vital_magnetic_field
Earth's magnetosphere is an invisible shield, protecting our planet from harmful solar radiation and many living organisms rely on it to navigate. Research shows the magnetic field is weakening and scientists are trying to understand why.
This resource is referenced here:
DIG Texas Blueprints:Unit Collection: Journey to the Center of the Earth: Earth's Structure
