Earthquakes
This is the point underground where an earthquake begins.
Focus
This type of fault forms when plates slide past each other.
strike-slip fault
The breaking down of rock.
weathering
Decayed plant and animal matter in soil.
humus
Remains or trace of ancient life.
fossil
This is the point on Earth’s surface directly above the focus.
Epicenter
This type of fault is caused by tension (pulling apart).
normal fault
The movement of sediment from one place to another.
erosion
Rock material left behind by glaciers.
till
Exact age of a rock in years.
absolute age
This tool records seismic waves.
seismograph
This type of fault is caused by compression (pushing together).
reverse fault
The dropping of sediment in a new place.
deposition
A ridge of sediment left by a glacier.
moraine
Age compared to other rocks.
relative age
Energy that travels through Earth during an earthquake.
seismic wave
This volcano is wide with gentle slopes.
shield volcano
Small pieces of rock.
sediment
Soil is formed from weathered rock and this organic material.
humus
Dinosaurs lived during this era.
Mesozoic Era
A smaller earthquake that happens after the main earthquake.
Aftershock
This volcano is tall, steep, and very explosive.
composite volcano
The downhill movement of rock and soil.
mass wasting
Name one way moving water changes the land.
Carves valleys, forms deltas, moves sediment, creates canyons
The oldest division of geologic time.
Precambrian Time