Science Test 2

What is the main composition of Earth’s atmosphere?

• 50% nitrogen, 30% oxygen, 20% other gases

• 78% oxygen, 21% nitrogen, 1% other gases

• 78% nitrogen, 21% oxygen, 1% other gases

• 90% nitrogen, 10% oxygen

Which of the following lists shows the correct order of the four main layers of the atmosphere (closest to Earth upward)?

• Stratosphere, Troposphere, Mesosphere, Thermosphere

• Troposphere, Stratosphere, Mesosphere, Thermosphere

• Mesosphere, Thermosphere, Stratosphere, Troposphere

• Troposphere, Mesosphere, Stratosphere, Thermosphere

What is the difference between humidity and relative humidity?

• Humidity is the temperature, while relative humidity is the pressure

• Humidity is the amount of water vapor in the air; relative humidity compares it to the air’s capacity at that temperature

• Humidity measures rainfall; relative humidity measures wind

• They mean the exact same thing

What happens during freezing rain?

• Rain falls as liquid, then freezes on contact with a surface below freezing

• Rain falls as ice pellets

• Rain turns into snow before reaching the ground

• Rain evaporates before hitting the ground

What is sleet?

• Precipitation that freezes into ice pellets before reaching the ground

• Snow that melts into rain

• Rain that freezes on surfaces

• Frozen fog droplets

What is an air mass?

• A group of clouds that move together

• A large body of air with the same temperature, humidity, and pressure

• A cold front forming in the atmosphere

• A moving thunderstorm

What are the four main types of air masses?

• Polar, Tropical, Maritime, Equatorial

• Continental Polar, Continental Tropical, Maritime Polar, Maritime Tropical

• Dry, Moist, Cold, Warm

• Arctic, Antarctic, Equatorial, Desert

What is a front?

• A type of air mass

• A boundary where two different air masses meet

• A kind of storm system

• A high-pressure zone

What are the four types of fronts?

• Cold, Warm, Occluded, Stationary

• Dry, Wet, Cloudy, Clear

• Maritime, Continental, Tropical, Polar

• Strong, Weak, Slow, Fast

In the Northern Hemisphere, which way does air circulate in a cyclone (low pressure system)?

• clockwise

• counterclockwise

• upward

• sideways