What causes low-pressure winds to swirl in a counter-clockwise direction?
|A)||the natural tendency of winds to blow from low to high pressure|
|C)||Earth's revolution around the Sun|
When two air masses of different densities collide, it's called__________.
|A)||a high pressure zone|
An occluded front occurs between _______ air masses.
|D)||an unknown number of|
The term stationary front describes a front __________.
|A)||that continues forward|
|B)||that is present for a brief amount of time|
|C)||that stops advancing|
What is the cause of the strong winds associated with thunderstorms?
|A)||weak updrafts of warm, moist air|
|B)||strong updrafts of dry air|
|D)||strong updrafts of warm, moist air and sinking, rain-cooled air|
Meteorologists refer to some floods as flash floods because __________.
|A)||there is often little warning before they occur|
|B)||they often occur during lightning storms|
|C)||they last for extended periods of time|
|D)||they know about them far in advance|
How does lightning occur during a storm?
|A)||Converging fronts collide.|
|B)||Different parts of a cloud become oppositely charged, and current flows between them.|
|C)||The relative humidity drops.|
|D)||The atmospheric pressure suddenly rises.|
What creates a wind shear?
|A)||a difference in wind direction and speed|
|B)||similar wind speeds and directions|
What is the difference between a tornado and a hurricane?
|A)||Tornadoes occur over sea and hurricanes occur over land.|
|B)||They are the same things.|
|C)||Tornadoes happen during winter and hurricanes happen in the summer.|
|D)||Tornadoes occur over land and hurricanes occur over sea.|
What specifications classify a storm as a blizzard?
|A)||severe winds, temperatures below -12º Celsius, and poor visibility for 3 h or more|
|B)||severe winds, temperatures below -12º Celsius, and poor visibility|
|C)||severe winds, temperatures below -12º Celsius, and poor visibility for less than 1 h|
|D)||temperatures below -12º Celsius and rainfall|