Science In class study test

The Richter scale measures ground shake on a scale of 1-10, but is not very __________.

accurate

MMS measures the magnitude of the __________.

waves

Each unit of the Richter scale represents __________ times the previous unit.

10x

California, Oregon, and Washington are prone to earthquakes because they are near __________ and fault zones.

faults

The Ring of __________ is a region with a high level of tectonic activity.

Fire

Alfred Wegener noticed that all the continents fit together like a __________.

puzzle

Wegener also found mountain ranges that had been __________ in half.

split

Wegener lacked __________ to prove continental movement.

time and data

A map of earthquakes and __________ helped to support the theory of plate tectonics.

volcanoes

The three types of plate boundaries are __________, convergent, and divergent.

transform

Compression results from __________ boundaries where mountains form.

convergent

Tension occurs at __________ boundaries, forming rift valleys.

divergent

Shear stress occurs at __________ boundaries like the San Andreas Fault.

transform

Igneous rock melts into __________ or magma before cooling and crystallizing.

lava

The process that changes sedimentary rock back into igneous rock involves __________ and cementation.

uplift

The mantle has convection currents that drive __________ motion.

plate

Isostasy refers to the gravitational __________ of the crust and mantle.

equilibrium

Subsidence occurs when the crust is pushed __________ into the earth.

down deeper

Strain is the change in the shape of rocks caused by __________.

stress

Plastic strain is when stress is applied but does not return to its __________ shape.

original

Elastic strain is when stress is applied but does go back to its __________ shape.

original