test 4 Flashcards
What are the three major factors that influence global weather?
Sun, Earth’s rotation, and water (especially oceans)
What is the Greenhouse Effect?
It’s when gases in Earth’s atmosphere trap heat from the sun, keeping the planet warm
Name some Greenhouse Gases.
CO₂, CH₄ (methane), N₂O (nitrous oxide), water vapor.
What is connection in cloud and precipitation formation?
Warm air rises, cools, and condenses to form clouds and precipitation.
What drives global air circulation patterns?
Heat from the sun, Earth’s rotation, and the Coriolis Effect.
What’s the difference between cold and warm fronts?
Cold front: cold air pushes warm air up (stormy).
Warm front: warm air slides over cold air (steady rain).
What are El Niño and La Niña?
El Niño warms the Pacific Ocean; La Niña cools it, affecting global weather.
What do ocean currents do?
They move warm and cold water around the globe, influencing climate.
What causes Earth’s seasons?
Earth’s tilt on its axis as it orbits the Sun.
What causes tornadoes?
a cold air mass collides with a warm air mass, causing violent spinning winds
What causes hurricanes?
warm ocean water (over 25°C), which fuels rising air and creates low pressure systems that intensify into storms.
Why don’t hurricanes hit the west coast of the Americas?
Ocean currents and wind patterns push them westward.
Why do hurricanes weaken over land?
They lose their energy source—warm ocean water.
What is the size of most hurricanes and the eye?
Hurricane: 300–400 miles wide. Eye: 20–40 miles wide.
When is tornado season?
Spring and early summer.
How fast do tornadoes move?
30–70 mph across the ground.
What is a wall cloud?
A rotating cloud under a thunderstorm—can spawn tornadoes.
Why lie in a ditch during a tornado?
It protects from flying debris.
What causes most tornado deaths?
Flying debris.
Where do Atlantic hurricanes start?
Off West Africa over warm water.
Why are coastal populations at high risk?
Many residents are new and unprepared.
Where is pressure lowest in a hurricane?
In the eye—can drop below 920 millibars.
When is hurricane season?
August–September (oceans are warmest).
What causes storm surge?
Low atmospheric preasure and strong hurrican winds