Earth's rotation spins Earth's liquid metal outer core around its solid metal inner core. How does this phenomenon make life on Earth possible?
Oa. It generates enough thermal energy to keep water on Earth liquid, but not so much that the water boils away.
Ob. It generates electrical currents in the atmosphere, which causes lightning to fix atoms of nitrogen into compounds that living things can use.
Oc. It creates the magnetosphere, which diverts high-energy particles from space away from Earth's surface.
Od. It attracts photons and other solar emissions that warm Earth and provide energy for ecosystems.