Around 400 million years old
Answer:
bc geocentric is the sun revolving around the earth while heliocentric is the earth revolving around the sun
Answer:
I think it's the top left answer choice because top right is a new moon, bottom left is a waxing crescent, and bottom right is 1st quarter.
Answer:
Actually the radiation belts are a negative side effect of the earths magnetic field as well as the Suns magnetic field. As cosmic particles collide with particles in the atmosphere they decay into energetic protons while the outer belt is mostly electrons made in geomagnetic storms.
if it didn't exist we could launch more satellites or have larger space stations without the worry of perpetual radiation exposure as for earth there would be no negative consequences to the loss of the energy.
Migration is when the birds go from south to north, north to east, east to north, and south to east.
The reasons for migration is that when it is cold the births fly north to south to find somewhere warmer (Like Florida). Birds can't fly in the cold so they fly to the warmer area.
