Rock Elements, Inc.
Area=9 sq. ft.
3 ft.
Digital image. Wikimedia Commons.
Data Set 1
3 ft.
Students will use the table listing the different rocks used in the garden designs, along with size, does the rock sink or float, color, weight, and
cost.
Rocks Used in
Garden Design
Size: the size of
the rock
Basalt, Granite,
Obsidian (Igneous
Rocks)
Coal, Chalk,
Conglomerate
(Sedimentary Rocks)
Marble, Schist,
Slate (Metamorphic
Rocks)
*5 lbs. bag of rocks=1 sq. ft.
pebble
Sink or Float:
does the rock sink
or float
Color: what color
features the rock
has
Weight: how many
rocks will be used
(total weight in
pounds)
Cost: how much
the cost will be per
bag of rocks
basalt-float
granite-sink
obsidian-sink
basalt-dark color, with
fine grains
granite-speckled, with
large crystals in pink,
white, and dark gray
obsidian-like black glass;
may have white
“snowflake” patterns
250 lbs.
50 lbs./bag=$30
300 lbs.
25 lbs./bag=$20
200 lbs.
30 lbs./bag=$25
stone
coal-float
chalk-float
conglomerate-sink
pebble
marble-sink
schist-sink
slate-sink
coal-black, with shiny
patches
chalk-white and
powdery; may rub off on
hands
conglomerate-sand
grains and pebbles of
different kinds of rocks
marble-light color
schist-wavy surface,
with a silvery shimmer
slate-splits into thin
layers; may have crystals
of pyrite (“fool’s gold”)