| Sound waves with frequencies below the lower audible limit of human hearing, typically less than 20 Hz. | Infrasound Waves |
| What are infrasound waves? | Sound waves with frequencies below the lower audible limit of human hearing, typically less than 20 Hz. |
| Waves produced by earthquakes or other seismic activity, which propagate through the Earth's crust and cause ground movement. | Seismic Waves |
| What are seismic waves? | Waves produced by earthquakes or other seismic activity, which propagate through the Earth's crust and cause ground movement. |
| Primary waves, a type of seismic wave that is a longitudinal wave and can travel through solids and liquids. | P-Waves |
| What are P-waves? | Primary waves, a type of seismic wave that is a longitudinal wave and can travel through solids and liquids. |
| Secondary waves, a type of seismic wave that is a transverse wave and can only travel through solids. | S-Waves |
| What are S-waves? | Secondary waves, a type of seismic wave that is a transverse wave and can only travel through solids. |
| A wave in which the particles of the medium vibrate parallel to the direction of wave propagation. | Longitudinal Wave |
| What is a longitudinal wave? | A wave in which the particles of the medium vibrate parallel to the direction of wave propagation. |
| A wave in which the particles of the medium vibrate perpendicular to the direction of wave propagation. | Transverse Wave |
| What is a transverse wave? | A wave in which the particles of the medium vibrate perpendicular to the direction of wave propagation. |
| The speed of an object in a particular direction. | Velocity |
| Which seismic wave type is faster, P-waves or S-waves? | P-waves. |
| Waves produced by earthquakes or other seismic activity, which propagate through the Earth's crust and cause ground movement. | Seismic Waves |
| What are seismic waves? | Waves produced by earthquakes or other seismic activity, which propagate through the Earth's crust and cause ground movement. |
| The layer of the Earth's interior located beneath the mantle and above the inner core, composed primarily of liquid iron and nickel. | Outer Core |
| What is the outer core? | The layer of the Earth's interior located beneath the mantle and above the inner core, composed primarily of liquid iron and nickel. |
| Primary waves, a type of seismic wave that is a longitudinal wave and can travel through solids and liquids. | P-Waves |
| What are P-waves? | Primary waves, a type of seismic wave that is a longitudinal wave and can travel through solids and liquids. |
| Secondary waves, a type of seismic wave that is a transverse wave and can only travel through solids. | S-Waves |
| What are S-waves? | Secondary waves, a type of seismic wave that is a transverse wave and can only travel through solids. |
| The liquid layer of the Earth's outer core, as indicated by the transmission of P-waves but not S-waves through this region. | Liquid Outer Core |
| How do seismic waves provide evidence for the liquid outer core of the Earth? | P-waves are detected on the opposite side of the world after an earthquake, indicating that they can travel through liquid, whereas S-waves are not detected, suggesting that the outer core must be liquid. |
| Sound waves with frequencies below the lower audible limit of human hearing, typically less than 20 Hz. | Infrasound Waves |
| What are infrasound waves? | Sound waves with frequencies below the lower audible limit of human hearing, typically less than 20 Hz. |
| The bouncing back of a wave when it hits a surface through which it cannot pass. | Reflection |
| What is reflection? | The bouncing back of a wave when it hits a surface through which it cannot pass. |
| The velocity at which infrasound waves travel through rock, typically around 7000 meters per second. | Speed of Infrasound in Rock |
| What is the speed of infrasound in rock? | Typically around 7000 meters per second. |
| The process of determining the length or extent between two points, often using time measurements of reflected waves. | Distance Calculation |
| What is distance calculation? | The process of determining the length or extent between two points, often using time measurements of reflected waves. |
| A natural accumulation of petroleum beneath the Earth's surface, often found in rock formations. | Oil Deposit |
| What is an oil deposit? | A natural accumulation of petroleum beneath the Earth's surface, often found in rock formations. |
| The process of determining the vertical distance from a surface to a point beneath, often using time measurements of reflected waves. | Depth Calculation |
| How is the depth of an oil deposit calculated using infrasound waves? | By measuring the time it takes for infrasound waves to travel to the oil deposit and back, and applying the formula for distance. |
