Factors that determine the resistance of rock to denudation

Is water wet? and is fire on fire?

You have been tasked with sorting the rock samples shown into three categories, with two rocks in each category. what attribute would you use to sort these rocks? which rocks would be in each category? rocks: obsidian, coquina limestone, granite, soapstone,pumice, and gneiss.

The dashed segment of the plotted experiment in the graph in the lesson is called an