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17 Cards in this Set
- Front
- Back
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crust |
thinnest most outer layer |
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mantle |
Softer layer under crust Convection occurs here Thickest layer |
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outer core |
Outer Liquid iron and nickel Only liquid layer Causes Earth’s magnetic field |
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inner core |
Hottest layer Solid iron - pressure |
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How do scientists study the Earth’s core? |
Direct observations vs. indirect observations Seismic waves Core samples { not from earth’s core } |
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What evidence did Wegener have for continental drift? |
Mountain ranges match Coast lines appear to fit together Fossils matched across continents Coal fields match up Climate change Scratches on rocks / glaciers / tropical Fossils from warm- cold Fossils from cold- warm
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What is Pangaea? |
Map / past of earth Continents connected Billion years ago Last time all continents were connected “ all land” or “ all Earth” |
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What happened to Pangaea? |
Slowly broke apart / present day Broke - convection inside earth |
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What did Wegener’s theory lack? |
How it separated How it moved |
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What did Hess add to Wegener’s theory? |
Proof that pangea happened how/ seafloor spreading |
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What is meant by seafloor spreading? What evidence do we have? |
The seafloor is growing The ridge is adding new rock Pangea |
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What did early scientists think the ocean floor looked like? |
Flat / like the beach |
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How did Hess change this idea? |
It proved that pangea was real |
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layers of the earth [in order] |
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where does convection occur |
Mantle
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where is the lithosphere |
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where is the Asthenosphere |
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