1. Over Earth’s history the continents have “drifted”.
This has taken hundreds of millions of years…GEOLOGIC TIME
Over Earth’s history the continents have “drifted”.

2. Remember these names?

3. During which geologic period did the ancient continent of Pangaea break apart?
(1) Permian (3) Triassic
(2) Pennsylvanian (4) Cambrian

4. Continents move through time

5. PLATE TECTONICS! The proof… Looks like puzzle pieces
Matching rock strata (layers)
Matching fossils
PLATE TECTONICS!

6. Convection currents—hot, less dense magma rises and cooler more dense magma sinks.
These density currents change Earth’s surface (just like they cause weather in the atmosphere).

10. There are THREE ways pieces of the crust—plates—can move with respect to each other.

12. Pg 10
Pg 5

14. Pg 10
Pg 5

16. Pg 5

18. This type of plate boundary is known as (1) Divergence (3) Spreading
The diagram below is a location where two tectonic plates meet.
This type of plate boundary is known as
(1) Divergence (3) Spreading
(2) Convergence (4) Rifting