Astronomy Review 2

exam on october 30th

absolute age

the exact age of something

relative age

around the age, or a guess. The person to my left is older than me

terrestrial planet

smaller planets

Jovian

giant planet

Crust Layer

Top layer of earth. We live on this, thin

Mantle

Made up of rocky (plastics), silicates, and this layer is under pressure

Liquid Core

Liquid metals such as Iron and Nickel, 3rd layer

Inner Core

4th level, made up of hardened levels, and is under so much pressure the metals are not liquid

Primary Waves

longitudinal waves

Secondary Waves

transverse waves

Refraction

Light passes into materials and the light reflects through different densities

Shear Waves

Up and down motion

Pressure Waves

Side to Side motion

Seismometers

Measure waves

Half Life

time for an original material to decay in half

Dynamo Effect

The free charges in the liquid core moves around due to earths roation which creates a magnetic field that protects us from solar wind and other particles

Northern Lights

Developed by energetic particles interact with gas and exciting the gas which creates the northern light. More common up north and are very dramatic