Uranium-235=710million The age of Earth was first established in 1953 when Claire C. Patterson of the California Institute of
Technology used a uranium-lead clock to analyze rock. In comparing amounts of uranium-235 with lead-207,
he established that about 8 half-lives of uranium-207 had passed since the rock formed. Using this data,
estimate the age of Earth.
710 m x 8 =

i would think klcio3

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.