Date Session # Activity Page Warm Up….page 10 Complete the WHO DUNIT(left) section of the worksheet at your desk Date Session # Activity Page 11/18-19 6 Earth’s Future Quick Write 8 Superposition notes & Practice 9 11/20-21 7 Who Dun It 10 Superposition Challenge 11 Rock Layer Correlation 12 Homework: Notebook check/turn in Tuesday

8.E.2 Understand the history of Earth and its life forms based on evidence of change recorded in fossil records and landforms. 8.E.2.1 Infer the age of Earth and relative age of rocks and fossils from index fossils and ordering of rocks layers (relative dating and radioactive dating) 8.E.2.2 Explain the use of fossils, ice cores, composition of sedimentary rocks, faults, and igneous rock formations found in rock layers as evidence of the history of the Earth and its changing life forms

Obj: TLW be explain the different methods for determining the age of rock layers by creating and comparing models and interpreting & correlating stratigraphy diagrams.

Law of Superposition: in horizontal sedimentary rock layers, the oldest is on the bottom and each higher layer is younger than the layer underneath it Stack three layers of clay (lightly), draw it into the superposition area of your notes, label youngest and oldest layer

Overturning: Horizontal rock layers tilt or fold due to movement of tectonic plates. Using the layers created previously, gently fold your layers in half (like a taco). Draw it into the overturning section of your notes. Label the youngest and oldest layers.

oldest middle youngest

Unconformity a gap in the geologic record showing where some rock layers have been lost because of weathering and erosion.

Mechanical Weathering (wind, water, gravity, ice wedging)

Mechanical Weathering (wind, water, gravity, ice wedging)

Chemical weathering (acid rain most common)

Unconformity

Unconformity 1. Blue rock layer is deposited 2. Yellow rock layer is deposited 3. Yellow rock layer is weathered and eroded, creating an unconformity 4. Green rock layer is deposited Complete deposition of green rock layer

Carefully unfold your rock layers. Gently remove the top layer. Unconformity: a gap in the geologic record showing where some rock layers have been lost because of weathering and erosion. Mechanical weathering: wind, water examples Chemical weathering: acid rain examples Biological – tree roots Carefully unfold your rock layers. Gently remove the top layer. “Erode” (remove) part of the middle layer Replace the top layer Draw this into the unconformity section of your notes. Label the part of your diagram that is the unconformity.

Unconformity http://www. classzone

Fault: a break in earth’s crust Fault: a break in earth’s crust. When examining rock layers, the fault will have occurred after the layers it cuts across and before the continuous horizontal layers above it.

Fault: a break in earth’s crust Fault: a break in earth’s crust. When examining rock layers, the fault will have occurred after the layers it cuts across and before the continuous horizontal layers above it. Happened: Sixth Fifth Fourth Third Second First

Intrusion: lava can cut/melt through rock layers Intrusion: lava can cut/melt through rock layers. It cools and hardens into igneous rock on the surface. It is younger than the sedimentary layers it cuts through and may be older than the sedimentary layers above it.

Intrusion: lava can cut/melt through rock layers Intrusion: lava can cut/melt through rock layers. It cools and hardens into igneous rock on the surface. It is younger than the sedimentary layers it cuts through and may be older than the sedimentary layers above it. Carefully layer the three clay colors again Insert your pencil through the bottom two layers, make sure you can see it Draw the clay model in the intrusion/extrusion section of your notes Label the youngest and oldest layer, label the intrusion.

Intrusion

The fault was caused by a ___________ Which letter is the fault? ____________ The intrusion is letter _______________ The intrusion is caused by ___________ What letter represents an unconformity? _______

Practice…..

Superposition Challenge

Index Fossil Correlation Activity

Index Fossil Correlation Activity