Global hazards + Resource reliance

what’s a low pressure system

warm air rises which then cools and condenses, crreating clouds and rain

key→ ‘low’ air wants to rise

what’s a high pressure system

air sinks which means it warms and is unable to condense, creating clear skies

key→ ‘high’ air wants to sink

what are the three loops in the atmosphere (with degrees)

hadley→0-30

ferrell→30-60

polar→60-90

what is a el niño

a weather event where trade winds reverse direction making floods in south america

what’s an el nina

a weather event which is the opposite to el niño, making australia have floods

structure of the earth (inner to outer)

1. core (solid inner + liquid outer)

2. mantle (molten rock)

3. crust

4. tectonic plates (continental + oceanic)

what are the 4 types of plate boundaries

1. constructive ← →

2. destructive → ←

3. conservative → ← (lightly)

4. collision= sideways past eachother

what do destructive boundaries create

they create volcanoes and trenches from the oceanic plate subducting into the mantle and then making a pool or magma which rises and erupts onto the surface

which boundaries create the worst earthquakes

destructive and conservative

how do earthquakes happen

-tension building and being released

1. plates go to new position sending shock waves onto earths surface

2. shocks originate at focus, where they’re strongest

3. epicentre is point on earth right above the focus

whats the malthusian theory

population growth will eventually outweigh food production, leaving many hungry

whats the boserup theory

population growth leads to us inventing new methods of food production

impacts to meeting resource demands

intensive agriculture→ harmful chemicals

deforestation

overfishing→ destroys ecosystems

factors affecting food security

climate→ overall higher temps reduces rainfall

technology→ increased crop yield (gm crops)

conflict→ some farmers may be forced to leave their land

impacts of food insecurity

rising food prices→ less available

debts→ high pricing for farmers supplies

famine→ high levels of undernourishment

what are urban gardens

small scale food growing spaces in cities, which improve food security and community wellbeing