Follows Don as he sees different kinds of rocks at a granite quarry, sandstone cliff and museum. Demonstrates the effects of water, heat and pressure in the formation of rocks.
Jan 19, 1991
Jan 13, 2016
Feb 2, 2021
Oct 1, 2007
Nov 30, 2017
Jan 1, 1999
Feb 15, 2025
Oct 25, 2025
Jan 1, 1948
Mar 8, 2005
Apr 18, 2020
Nov 17, 2018
Nov 1, 2019
Oct 20, 2016
Jan 1, 1971
Apr 28, 2023
Feb 6, 2023
Sep 20, 2005
Sep 28, 2018
Dec 31, 2018
