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 SamplesWhat 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, 10sandstone -- 6, 8shale -- 7