GEOL 105 Exam 2

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radius of the earth

4000 miles

igneous rocks that are created by partial melting of ocean curst in a subduction zone

andesite

partially molten layer of igneous rock underlies the atmophere

asthenosphere

types of plate boundries

convergent, divergent, transform

Earth's internal zones

crust, mantle, outer core, inner core

a rock mass that underlies (below) a titled flat is called a ___ block

footwall

down-dropped blocks

grabens

the energy that drives tectonic engine/plate movement

heat, which comes from radioactive decay of uranium, thorium, and potassium

The inner core is made of

iron and nickle

define a period of mountain buliding

orogeny

the three basic types of heat transfers

radiation, convection, and conduction

New oceanic crust is created at

spreading ridges at divergent plate boundries

structural world that looks like a sag

syncline

velocity where tectonic plates move today

they move at the same rate of fingernail growth


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