Global circulation

What is wind?

• Large scale movement of air caused by differences in air pressure

• Large scale movement of CO2 caused by differences in air pressure

• Large scale movement of air caused by differences in temperature

• Large scale movement of temperature caused by differences in air pressure

Differences in air pressure are caused by...?

• Differences in the earths rotation

• Differences in temperature

• Differences in rainfall

• Differences in sea level

Winds move from...

• high pressure to low pressure

• low pressure to high pressure

Warm air...

• sinks

• rises

Cold air ...

• sinks

• rises

True or false - warm air rises, cools and condenses and forms clouds, this is called low pressure

• True

• False

Cool air sinks at the sub-tropical highs, what does this lead to? SELECT TWO

• Deserts

• Cloudless skies and low rainfall

• Tropical rainforests

• Clouds and rainfall

What are trade winds?

• Surface winds blowing towards the equator

• Atmospheric winds

• Winds blowing away from the equator

• Low pressure winds

Surface winds blowing towards the poles are called ...

• westerlies

• easterlies

• southerlies

• northerlies

Why is it hot and dry at sub-tropical highs?

• Cold air sinking, no clouds can form

• Warm air sinking, no clouds can form

• Cold air rising

• Warm air rising