Across
- 5. Regions of space, typically within nebulae, where gas and dust come together under gravity to form new stars.
- 8. A vibration that travels through a medium, such as air or water, and can be heard when it reaches a person's or animal's ear.
Down
- 1. The plural form of nebula, referring to multiple clouds of gas and dust in space that are sites of star formation or remnants of exploded stars.
- 2. A vast cloud of gas and dust in space, often illuminated by nearby stars, where new stars and planetary systems can form.
- 3. The number of occurrences of a repeating event per unit of time, commonly used to describe the number of wave cycles that pass a fixed point per second, measured in hertz (Hz).
- 4. Large, rigid pieces of Earth's lithosphere that move and interact at their boundaries, causing geological activities such as earthquakes, volcanic eruptions, and mountain formation.
- 6. The study of the structure and movement of Earth's lithosphere, including the processes that shape the planet's surface, such as plate tectonics and mountain building.
- 7. The maximum extent of a vibration or displacement of a wave, measured from its equilibrium position, often related to the loudness of sound or the intensity of a signal.