Relative Dating
Absolute Dating
Plate Tectonics
CD & Seafloor
100
What we learn from relative dating
Comparative age of rocks/fossils
100
What we learn from absolute dating
Exact ages of sediments or fossils
100
Tectonic plates are:
Large chunks of rock in the lithosphere; constantly moving pieces of Earth under the crust
100
Define Continental Drift
Continents are moving over time relative to each other
200
The difference between absolute and relative dating
Relative dating does not give us an exact year, relative dating does
200
Compare to relative dating
Absolute dating will give you exact date but relative dating is only compared to other samples
200
Tectonic plates are constantly moving
(True/False)
True
200
The three main pieces of evidence for Wegener's theory of CD are:
1. Fossils that match across continents
2. Landforms that match across continents
3. Continents fit together like puzzle pieces
300
Which layer would be oldest in this setup:
A
B
C
D
D
300
Define half-life
A half-life is how long it takes for half of a radioactive material to decay
300
List the three types of plate boundaries
Convergent, divergent, transform
300
Explain how seafloor spreading is evidence of Continental Drift Theory
New crust is created at divergent boundaries and old crust is pushed away, demonstrates continents moving away from each other. Also provides evidence of plate tectonics which move continents
400
List YOUNGEST to OLDEST
J, V, M, C, G, R, T
400
A scientist found a piece of fossilized wood. They know that it originally has 44 grams of carbon-14, and it now has 2.75g. How many half-lives have passed?
4 half-lives
44/2= 22
22/2= 11
11/2= 5.5
5.5/2= 2.75
400
Describe the formation of a volcanic island
Along a plate boundary or hotspot, magma heats crust and breaks through. Cools in ocean water and builds up new layers of rock until it reaches the surface
400
Explain what is shown by magnetic striping
Times throughout Earth's history where the magnetic field has flipped