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The _______ is the amount of time it takes for half of the remaining parent isotopes to decay into daughter isotopes.

The mechanism that operates along the oceanic ridge system, to create new seafloor, is _______

Mudflows that form on volcanos are called ____________.

Mountain systems, produced in part by volcanic activity associated with the subduction of oceanic lithosphere are called _______

What type of scale is used to quantify observed property damage to estimate the amount of ground shaking at a particular location?

A(n)  ______________ texture is associated with the trapping of gases in cooling magma as it solidifies, forming holes throughout the rock.

The _______ is a concept used to explain the formation and characteristics of the three basic rock types and how Earth’s natural processes, over long periods of time, change a rock from one form to another.

Which of the following is NOT a criterion of minerals?  

Which property is NOT often useful as a diagnostic property?

What type of sedimentary rock contains weathered pieces of minerals and rocks?