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180–200 million years ago

225 million years ago

135 million years ago

Earth today

65 million years ago

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B. Metal brackets

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walls

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�Sunset Crater

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1. Ore mixture added.

2. Ore mixture placed in blast furnace.

3. Chemical changes produce iron and carbon dioxide gas.

4. Iron and slag sink to bottom.

5. Molten iron and slag are poured off.

Coke Heatedair

Slagladle

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Coke-lime-stone-

iron oremixture

Hot metal car

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Ironoreand limestone

Skiphoist

18 Exploring Smelting Iron Ore

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Metamorphic RockMagma

Sedimentary Rock

Igneous Rock