What do we call the layer of gas surrounding a planet or star?

• Atmosphere

• Troposphere

• Outer Space

• Weather

In which layer does weather occur?

• Atmosphere

• Troposphere

• Exosphere

• Weatherosphere

In which layer of the atmosphere do planes fly?

• Mesosphere

• Stratosphere

• Exosphere

• Travelosphere

Gases in our atmosphere that remain constant are called

• variable gases

• gases

• water vapor

• permanent gases

Gases in our atmosphere that change due to activity in the environment are called

• permanent gases

• variable gases

• gases

• oxygen

The process by which water moves through the Earth and atmosphere is called the

• water cycle

• water circle

• water continuum

• water movement

The process that occurs when heat causes water to change from a liquid to a gas is called

• condensation

• precipitation

• evaporation

• collection

The cooling of water in the atmosphere as it changes from a gas to a liquid is called

• condensation

• precipitation

• evaporation

• collection

Water droplets that fall from the atmosphere are called

• condensation

• precipitation

• evaporation

• collection

Which gas makes up most of our atmosphere?

• Carbon Dioxide

• Oxygen

• Ozone

• Nitrogen