It is perhaps a little indelicate to ask our Mother Earth her age,
but Science asknowledges no shame and from time to time has
boldly attempted to wrest from her a secret which is
proverbially well guarded.

- Arthur Holmes, 1913


Key words or concepts:
Radioactivity (continued)
How to build an atomic bomb
How a nuclaar reactor works
Causes of sea level change
glaciation
expansion/contraction
change in volume of ocean ridge
Stratigraphy
transgression
onlapping sequence
regression
offlapping sequence

Useful links:

Earth Science Picture of the Day

Return to Historical Geology syllabus