Sound
How is all sound made?
By vibrations (when objects move quickly back and forth).
What is the imaginary line the Earth spins on?
Its axis.
This is the layer of gases that surrounds Earth.
Atmosphere.
Smoke from factories and cars can cause this type of pollution.
Air pollution.
When the Sun heats water and it changes into water vapor, this process is called...
Evaporation.
The loudness of a sound is called ...
Volume of the sound.
Earth takes this amount of time to orbit the Sun once.
365 days.
Clouds, rain, wind, and storms all happen in this part of Earth's atmosphere.
Troposphere.
Throwing trash into rivers, lakes, or oceans causes this type of pollution.
Water pollution.
When water vapor cools and changes into tiny water droplets, this process is called...
Condensation.
What describes how low or high a sound is?
Pitch.
This movement of the Earth causes day and night.
Rotation on its own axis.
The atmosphere is mostly made up of this gas.
Nitrogen (76%).
This type of pollution happens when trash is left on the ground instead of being put in a bin.
Land pollution.
This form of water is found in the air during evaporation.
Water vapour.
Materials that are good at stopping sound from travelling through them are called ...
Soundproof materials.
This natural object orbits Earth.
This layer contains the ozone layer, which helps protect Earth from harmful UV rays.
Stratosphere.
Planting more trees can help reduce air pollution because trees absorb this gas.
Carbon dioxide.
One of the biggest dams in the world is ...
Three Gorges Dam (China).
Through which state (solid, liquid, or gas) does sound travel the fastest?
Solids (because the particles are packed tightly together).
The path a planet follows around the Sun is called this.
Orbit.
This is the outermost layer of Earth's atmosphere.
Exosphere.
This action helps reduce pollution by using materials again instead of throwing them away.
Recycling.
This happens when water falls from clouds as rain, snow, sleet, or hail.
Precipitation.