1Daily Warm-Up Exercises Day 42 How do you perform an acid test, and what does it tell you about a rock sample? Squeeze a drop of hydrochloric acid onto the rock sample. If the rock fizzes, it probably contains calcium carbonate (calcite).

2 Sort Grand Canyon Rocks (Part 1, steps 16-26) Investigation 3 Grand Canyon Rocks

3 Discuss Rock Observations  What are some of the rock properties you observed and recorded? appearance, texture, hardness, color  How are the rocks alike?  How are they different?

4 Sort the Rocks  Sort the rocks from North Canyon into groups.  Sort the rocks from Nankoweap Canyon into groups.  Make up a descriptive name for each group of rocks.

5 Discuss Groups  How many groups do you have for the North Canyon rocks?  How many groups do you have for the Nankoweap rocks?  What properties did you use to sort the rocks?

6 Discuss Rock Samples Which rocks fizzed when touched by acid? 4, 5, 9 & 10 What can you conclude about those rocks? They contain calcite, so they are limestone. What property do rocks 6 and 8 share? They are sandy and rough. What kind of rocks do you think these are? sandstone

7 Label Rock Samples What properties does rock 7 have? smooth, black, some samples have fossils Rock 7 is called shale. Go back to your observation tables and label each rock sample as limestone, sandstone, or shale. limestone -- 4, 5, 9, 10 sandstone -- 6, 8 shale -- 7