continental drift. the continents are moving at one time all the continents were connected pangaea
TRANSCRIPT
Continental Drift Continental Drift • The continents are moving
• At one time all the continents were connected
• Pangaea
Continental DriftContinental Drift• 200 million years ago it
began to break apart
• About 2.5 cm/yr
• Became the 7 continents of today
Continental DriftContinental Drift• Alfred Wegener proposed this
idea in 1912• German scientist• Ideas were not accepted at first• Based his theory on 4 pieces of
evidence
1. Continent Shape1. Continent Shape• He noticed many continents
seemed to fit together like a giant jigsaw puzzle
Pangaea
2. Fossil Evidence2. Fossil Evidence• Similar animal and plant
fossils discovered in places far apart
• And in matching coastlines on different continents
3. Rock Evidence 3. Rock Evidence • Age and kinds of rocks and
minerals along the edge of one coastline
• Are similar to those on another continent
4. Mountain Evidence 4. Mountain Evidence
• Some mountain ranges on different continents seem to match
• As well as glacier “scars” or marks
THE END
• Let’s take some notes on continental drift now!