activity

also

astronomy

atmosphere

aurora

axis

blue

charged

core

dipole

direction

earth

earths

emanating

energy

extends

field

flare

from

geography

geology

geomagnetic

global

globe

graphic

gravity

illustration

interior

iron

isolated

known

light

lines

magnet

magnetic

magnetosphere

meets

nature

north

orbit

particles

physics

planet

polar

pole

radiation

rotation

science

shift

solar

south

space

stream

sun

surface

system

that

the

theory

ultraviolet

where

wind

world