Geology and Earth Structure

Orogenesis is the structural deformation of the Earth's lithosphere due to plate tectonic activity, resulting in the formation of mountains.

The Mercalli scale measures the intensity of an earthquake based on observed damage, while the Moment Magnitude scale measures the energy released.

P-waves (primary waves) are compressional seismic waves that push and pull material in the direction of wave propagation. They're the fastest seismic waves and arrive first. S-waves shear material side-to-side, surface waves travel along Earth's surface, and 'interior waves' isn't a standard seismic category.

The Grand Canyon was primarily carved by the Colorado River over millions of years. This process is a classic example of fluvial erosion.

Subsidence is the sinking or settling of the ground surface. This often occurs when underground materials, such as limestone, are dissolved by water, leading to the formation of sinkholes.

Seismic waves are the waves of energy caused by the sudden breaking of rock within the earth or an explosion. They are the energy that travels through the earth and is recorded on seismographs.

The Richter scale is a logarithmic scale used to express the magnitude of an earthquake. It quantifies the energy released during the seismic event.

An earthquake is a sudden shaking of the ground caused by the movement of tectonic plates or volcanic activity. It is distinct from cyclones (wind) or tsunamis (water waves).

Frequency is defined as the number of occurrences of a repeating event per unit of time, such as cycles per second (Hertz).

Magnitude measures the size of an earthquake based on the amplitude of seismic waves recorded by a seismograph.

The water table is the upper surface of the zone of saturation, where the soil or rocks are completely filled with water.

Tsunamis are large, powerful sea waves typically caused by underwater earthquakes, volcanic eruptions, or landslides that displace massive volumes of water.