Geologic Time
Which time period is the longest?
Precambrian Time
Crust
Scientist who proposed the theory of continental drift.
Alfred Wegener
Which type of crust is mostly granite
Continental crust
Converge
Absolute age is exact while relative age is a comparison.
The thin layer of gases surrounding Earth.
Atmosphere
The supercontinent that split into 7 separate continents.
Pangaea
It rises
Type of boundary that creates crust
Divergent
Easily recognized, abundant, wide geographic distribution, live a short time
The process by which molten material adds new oceanic crust to the ocean floor
Seafloor spreading
What were Wegener's 4 pieces of evidence?
Fossil evidence, continental fit, glacial evidence, landforms and rock layers
Oceanic crust
Type of boundary that creates a mid ocean ridge
Diverging of two plates carrying continental crust
Preserved remains of plant and animals from the remote past
Fossil
A current caused by the rising of heated fluid and sinking of cooled fluid.
Convection current
Why was Wegener's theory rejected?
What two theories were combined to create the theory of plate tectonics?
Continental drift and seafloor spreading
Type of boundary that creates folded mountains
Convergent plate boundary
If the same index fossils are found in different rock strata miles apart, what is probably true about the rock layers?
They are about the same age.
The theory stating that Earth's lithosphere is broken broken into huge plates that move and change in size over time.
Theory of Plate Tectonics
Who added to Wegener's evidence to complete the theory of plate tectonics?
Harry Hess
What causes plates to move?
The movement of magma in the mantle
Long chain of volcanoes that surrounds the Pacific Ocean
Ring of Fire