Most of Earth's weather occurs in the troposphere.
Where in the atmosphere does most of Earth's weather occur?
100
The California current flows from North to South.
What direction does this surface current flow?
100
This instrument is used to measure air pressure.
What is a barometer?
100
A wind system that reverses its direction seasonally.
What is a monsoon?
100
This front occurs when a cold air mass moves under a warm air mass, pushing the warm air upwards. This can cause heavy rain, thunderstorms, and snow, which do not last very long.
What is a cold front?
200
Warm air moves upward and cold air moves downward forming a circular pattern.
What are convection currents?
200
The surface current that flows near California is called the California Current.
What is the surface current that flows near California?
200
This instrument measures wind speed.
What is an anemometer?
200
Pacific storms produce these types of winds.
What is a cyclone?
200
This type of front occurs when warm air moves over a cold air mass, causing rain or snow that can last for hours.
What is a warm front?
300
Air movement in convection currents is caused by the sun's uneven heating of the Earth.
What causes air movement in convection currents?
300
Sleet and hail form when raindrops freeze as they fall to land.
How does sleet and hail form?
300
The weather will be fair if this instrument is increasing.
What is an increasing barometer?
300
This area is where a hurricane begins.
What is a warm ocean?
300
This symbol represents an area of cool, dense air that is surrounded on all sides by lower-pressure air.
What is a high-pressure system?
400
A land breeze occurs when the land cools faster than the sea causing the cool air to go out to the sea.
What causes a land breeze?
400
Fog forms when water vapor condenses into water droplets at ground level.
How does fog form?
400
These are the four types of air masses that form over the United States.
What are the continential tropical, continential polar, maritime tropical, and maritime polar air masses?
400
This type of storm can reach wind speeds of at least 119 km/hr (74 mi/hr).
What is a hurricane?
400
This symbol represents an area of warm, light air that is surrounded by higher-pressure air.
What is a low-pressure system?
500
The air pressure is the greatest at the Earth's surface because the air particles are closely packed together meaning the air is more dense.
Why is the air pressure greatest at Earth's surface?
500
In the summer, the ocean absorbs the sun's heat energy keeping the air around the ocean cooler. In the winter, the ocean releases the sun's heat energy warming the air around the ocean. This causes the Earth to be mild.
How does the oceans help keep Earth's weather mild?
500
In this area of pressure, the air is humid and there is a higher chance of rain.
What is low air pressure?
500
This occurs when the ocean's surface rises as high as 10 meters (33 feet) and can be as wide as 80-161 km (50-100 miles) and can cause massive damage to the coastline.
What is a storm surge?
500
This type of front is indicated on a weather map by a line with half circles.