(Fig. 12.20)

(Fig. 12.21)

(Fig. 12.22) (Fig. 12.23)

(Fig. 12.26)

LA - SF = ~550 km. How long will it take LA to reach SF? Very approximately 15 km/m.y. (= 1.5 cm/yr) LA - SF = ~550 km. How long will it take LA to reach SF?

Tectonic Setting divergent ocean/ ocean continent continent/continent transform earthquakes (depth?) Very shallow Shallow to deep more deep than shallow Shallow to moderate volcanism (what kind?) Basalt flows Mafic small volcanoes Cascade Range, Andes, Japan None (VERY rare) metamorphism (what conditions?) hydrothermal low T high P High T/low P, mod T/mod P High P and T Very minor

Which location indicated on the map is a plate boundary where oceanic lithosphere is currently being subducted? A B C D

Where would you expect to find the oldest oceanic lithosphere on a plate? At the mid-ocean ridge At the divergent plate boundary Near the continent Near a transform fault

What kind of boundary is the lithosphere–asthenosphere boundary? A temperature boundary A compositional boundary A mineralogic boundary