What two factors help protect the Earth fr
问题:
What two factors help protect the Earth from radiation
A.Magnetic field and atmosphere.
B.Rapid spin and molten iron-nickel core.
C.The Sun and the Moon.
D.Blue waters and white clouds.
What two factors help protect the Earth from radiation
A.Magnetic field and atmosphere.
B.Rapid spin and molten iron-nickel core.
C.The Sun and the Moon.
D.Blue waters and white clouds.