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The earth's magnetic shield has?

a) appeared only recently
b)disappeared for short periods of time
c)caused the earth's land masses to drift apart
d)little effect on life this planet
e)existed since the planet cooled

Just need to know if my answer or right or wrong. Thanks! :)

e

yes, correct. You have a very easy teacher.

thanks bobpursley :)

Your answer is correct! The Earth's magnetic shield, also known as the geomagnetic field, has indeed existed since the planet cooled. It is generated by the liquid iron outer core spinning around the solid iron inner core, creating what is called the geodynamo effect. This magnetic field plays a crucial role in protecting the planet from the harmful solar wind and cosmic rays. So, option e) is the correct choice. Well done!