There are labels on the containers

Observation

All of the seeds were planted on

the same day

Inference

Some of the plants were taller

than others

Observation

They put different

amounts of salt in the containers

Inference

One container has smaller plants

because it has the most salt

Inference

This experiment is to determine how salt affects plant

growth

Inference

The students are pleased with the

way the experiment is turning out

Inference

Limestone•Reacts to acid test by fizzing due to presence of calcite

•Rock #’s 11, 15

Sandstone•Rock made of grains of sands “glued” together

•Rock #’s 13, 16

Shale•Smooth rock, does not react with acid

•Rock #’s 12, 14

Erosion and Deposition

•Erosion: The wearing away of earth’s materials via water, wind, ice or gravity

•Deposition: Sediment that is eroded is then “deposited” or put down someplace. This sediment eventually hardens and becomes sedimentary rock

Observation and Inference

Observation InferenceSeveral different colored layers

X

Contained calcite XEnvironment when formed was a marine one

X

Reacted with acid x

Limestone

• Knew that it was limestone because it reacted with acid; sandstone and shale don’t react

• Layers and shell fossils were also good indicators

Erosion

• Water: flowing water carries away particles of sediment and carves away the land

• Ice: water seeps into rocks and freezes which, over time, causes the rocks to split

• Wind: wind picks up small particles and carries them away

Rock correlation• Mile 21

– Supai Sandstone

• Mile 41– Muav

limestone

Mile 35

Muav Limestone

because it is directly below

Redwall Limestone