Geography Revision Cards

Only available on StudyMode
  • Download(s) : 152
  • Published : January 21, 2013
Open Document
Text Preview
St Ivo School Geography Department - GCSE REVISION Solar Output – variations in amount of energy given off by sun – sunspots can affect solar output – e.g. reduction in sunspot activity between 1645-1715 likely cause of Little Ice Age Orbital Geometry – earth’s orbit of the sun varies in shape – when circular glacial periods have occurred, when elliptical warmer periods result (Milankovitch Cylces) www.geobytesgcse.wordpress.com

Name and describe 2 external factors which affect climate change

Year 11 - Challenges to the Planet

www.geobytesgcse.wordpress.com

St Ivo School Geography Department - GCSE REVISION

Describe how volcanic activity can affect global climate change

Year 11 - Challenges to the Planet

www.geobytesgcse.wordpress.com

Fold along here

Fold along here

Volcanic Dust puts huge amounts of ash and sulphur dioxide in the atmosphere – acts to block out solar radiation and can cause a decrease in global temperatures. e.g. Laki eruption – Iceland 1783 – reduced global temperatures and led to harvest failing in W Europe. www.geobytesgcse.wordpress.com

St Ivo School Geography Department - GCSE REVISION

 Temperatures have increased by 6 C since last ice age There have been fluctuations with warmer and colder periods 8,000-4,000 years ago – 2 warmer periods with cold spell in between 1450-1850 – Little Ice Age Since 1960s rapid increase in temperature www.geobytesgcse.wordpress.com

o

Describe the main changes in global climate since the end of the last ice age. Fold along here Fold along here

   

Year 11 - Challenges to the Planet

www.geobytesgcse.wordpress.com

St Ivo School Geography Department - GCSE REVISION Different types of surface have a different albedo – capacity of surface to reflect radiation.

How does surface reflection affect global temperatures?

Lighter surfaces – e.g. snow and ice reflect large amounts of radiation back to space (high albedo) – reduces temperatures. Reduction in snow and ice – less sunlight reflected back and temperatures warm www.geobytesgcse.wordpress.com

Year 11 - Challenges to the Planet

www.geobytesgcse.wordpress.com

St Ivo School Geography Department - GCSE REVISION

What is the name given to the cycles of orbital geometry?
Fold along here

Milankovitch Cycles

Year 11 - Challenges to the Planet

www.geobytesgcse.wordpress.com

www.geobytesgcse.wordpress.com

St Ivo School Geography Department - GCSE REVISION

Year 11 - Challenges to the Planet

www.geobytesgcse.wordpress.com

Fold along here

Describe how orbital geometry (including the tilt of the axis and the nature of the orbit) can affect climate change.

Earth’s orbit varies approx every 95,000 years – when circular leads to glacial periods, when more elliptical orbit – warmer periods. Title of axis varies between 21.5-24.5o – greater angle of tilt – warmer periods occur www.geobytesgcse.wordpress.com

St Ivo School Geography Department - GCSE REVISION

Any of: Give two examples of Greenhouse Gases. 1. 2. 3. 4. Chloroflurocarbons Carbon Dioxide Nitrous Oxide Methane www.geobytesgcse.wordpress.com

Year 11 - Challenges to the Planet

www.geobytesgcse.wordpress.com

St Ivo School Geography Department - GCSE REVISION

Year 11 - Challenges to the Planet

www.geobytesgcse.wordpress.com

Fold along here

Give two sources of: (i) Methane (ii) Carbon Dioxide

Fold along here

Methane sources: Wetlands, paddy fields, landfills, burning vegetation, bowels of cattle and sheep Carbon Dioxide sources: Burning of fossil fuels (coal, oil and gas) – in power stations and from car exhausts www.geobytesgcse.wordpress.com

St Ivo School Geography Department - GCSE REVISION Methane Increasing: increase in population (particularly LEDCs) – increase demand for rice to feed expanding population and an increase in western style diets (more cattle & sheep raised for meat); also rising temps see release of methane from permafrost....
tracking img