This is a wonderful resource for learning about Physics:

http://hyperphysics.phy-astr.gsu.edu/HBASE/hph.html

For example:

Geological time scale: http://hyperphysics.phy-astr.gsu.edu/HBASE/geophys/geotime.html#c1

Solar Iradiance: http://hyperphysics.phy-astr.gsu.edu/HBASE/vision/solirrad.html#c1