Rock Layers
Layers of the Earth
Plate Tectonics
Miscellaneous
Fossils/Time Scale
100
Where do we find the oldest rock layers in sedimentary rock?
Bottom
100
Earth's middle layer
mantle
100
How do scientists know about Earth's history?
looking at fossils
100
How do we organize events in Earth's history?
Geologic Time Scale
200
Materiels that SETTLE into LAYERS and harden
Sedimentary rock
200
Center of the Earth
core
200
How have many of the eras in the time scale ended?
Mass extinction
300
Marks or remains of a once living thing.
fossils
300
Earth's solid outer layer
crust
300
How do we compare the age of fossils?
Compare the rock layers (relative age)
400
What causes the movement of tectonic plates?
Convection currents in the mantle
400
What causes changes in Earth's surface?
Movement of tectonic plates
400
Where are most of the active volcanoes in the world found?
Ring of fire
400
Fossil that we use to identify same age of rock layers. They lived for a short time, but in a wide area.
Index fossil
500
Refer to Figure 2 and place the fossils to arrange them in sequence, according to their first appearance on Earth.
Trilobite, Dragon Fly, Dinosuar
500
Evidence of the same fossils on different continents proves
Theory of plate tectonics/continental drift/Pangaea
500
As forces push on rock, what can happen?
Folding
500
Which law helps scientists learn about Earth's history with the relative age of rock layers?
Law of superposition