Chapter 7, Lesson 1Earth’s Changing Crust

faultgeologistmagma

lavaweathering

erosiondepositionsurveyorelevation

seismographtension

compressionshear

fault – a crack in the Earth’s crust

geologist – scientists who study Earth

magma – hot, molten rock beneath the earth’s surface

lava – magma that reaches the earth’s surface

weathering – the breaking down of the materials of the

earth’s crust

Click on this picture to explore different types of weathering.

erosion – is the picking up and carrying away of weathered

pieces of earth

deposition – the dropping of bits of rock

surveyor – people who measure the earth

elevation – the height of land above sea level

seismograph – a device used to measure vibrations of the Earth’s

crust

tension – stretches or pulls the Earth’s crust apart

compression – squeezes or pushed the Earth’s crust together

shear – twists, tears, or pushes one part of the crust past another