Ch 4 Igneous Rocks Page 3

E. Common Igneous Rocks

1. Granite and Rhyolite

Granite - most common ________________________ igneous rock - basement rock

- forms mountains - Rockies, Adirondacks, Black Hills

2. Basalt and Gabbro

Basalt - most common rock on ______________________ and forms basalt plateaus

Gabbro - uncommon, found in deeper parts of _______________

3. Andesite and Diorite

Andesite - Andes Mtns - S. America

Diorite - Deep under Andes Mtns

4. Peridotite - __________ mantle

F. Partial Melting

1. ________________________ Melting - when you heat a rock, the minerals with the

lowest melting point melts first

2. In general, minerals with the highest silica content melt at the lowest temperature

3. ____________________ reaction series - when magma cools:

Crystallize first - highest temperature - lowest % Si

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