Transcript Day 42

1
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).
Daily Warm-Up Exercises
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